\u4f8b\u5b50：<\/p>\n
create \u00a0table user1 (
\n \u00a0 id int,
\n \u00a0 name varchar(20) comment '\u7528\u6237\u540d',
\n \u00a0 password char(32) comment '\u7528\u6237\u7684\u5bc6\u7801',
\n \u00a0 birthday date comment '\u7528\u6237\u7684\u751f\u65e5'
\n) character set utf8 engine MyISAM;
\ncreate \u00a0table user2 (
\n \u00a0 id int,
\n \u00a0 name varchar(20) comment '\u7528\u6237\u540d',
\n \u00a0 password char(32) comment '\u7528\u6237\u7684\u5bc6\u7801',
\n \u00a0 birthday date comment '\u7528\u6237\u7684\u751f\u65e5'
\n) character set utf8 engine InnoDB; <\/p>\n
\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce，\u521b\u5efa\u8868\u7684\u6587\u4ef6\u4e0d\u4e00\u6837\u3002<\/p>\n
root@iZuf6dza8bf7vp0zjipnhmZ:\/var\/lib\/mysql\/users# ll
\ntotal 128
\ndrwxr-x— 2 mysql mysql 4096 Aug 10 01:32 .\/
\ndrwx—— 9 mysql mysql 4096 Aug 10 01:21 ..\/
\n-rw-r—– 1 mysql mysql 3989 Aug 10 01:27 user1_365.sdi
\n-rw-r—– 1 mysql mysql 0 Aug 10 01:27 user1.MYD
\n-rw-r—– 1 mysql mysql 1024 Aug 10 01:27 user1.MYI
\n-rw-r—– 1 mysql mysql 114688 Aug 10 01:32 user2.ibd<\/p>\n
2. \u67e5\u770b\u8868\u7ed3\u6784<\/h2>\n
desc \u8868\u540d; <\/p>\n
desc：describe，\u63cf\u8ff0<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260813122529-6a7db7b934eb3.png\")
<\/p>\n
3. \u4fee\u6539\u8868<\/h2>\n
\u5728\u9879\u76ee\u5b9e\u9645\u5f00\u53d1\u4e2d，\u7ecf\u5e38\u4fee\u6539\u67d0\u4e2a\u8868\u7684\u7ed3\u6784，\u6bd4\u5982\u5b57\u6bb5\u540d\u5b57，\u5b57\u6bb5\u5927\u5c0f，\u5b57\u6bb5\u7c7b\u578b，\u8868\u7684\u5b57\u7b26\u96c6\u7c7b\u578b，\u8868\u7684\u5b58\u50a8\u5f15\u64ce\u7b49\u7b49\u3002\u6211\u4eec\u8fd8\u6709\u9700\u6c42，\u6dfb\u52a0\u5b57\u6bb5，\u5220\u9664\u5b57\u6bb5\u7b49\u7b49\u3002\u8fd9\u65f6\u6211\u4eec\u5c31\u9700\u8981\u4fee\u6539\u8868\u3002<\/p>\n
ALTER TABLE tablename ADD (column datatype [DEFAULT expr][,column
\ndatatype]…);<\/p>\n
ALTER TABLE tablename MODIfy (column datatype [DEFAULT expr][,column
\ndatatype]…);<\/p>\n
ALTER TABLE tablename DROP (column);<\/p>\n
3.1 \u63d2\u5165\u6570\u636e<\/h3>\n\n- \u5728 user1 \u8868\u6dfb\u52a0\u4e24\u6761\u8bb0\u5f55：<\/li>\n<\/ul>\n
insert into user1 values(1,'\u5f20\u4e09','123456','2005-10-15'),(2,'\u674e\u56db','54321','2004-10-
\n15');<\/p>\n
3.2 \u6dfb\u52a0\u5b57\u6bb5<\/h3>\n\n- \u5728 user1 \u8868\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5，\u7528\u6237\u4fdd\u5b58\u56fe\u7247\u8def\u5f84：<\/li>\n<\/ul>\n
\u653e\u5230 birthday \u5b57\u6bb5\u540e：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' after
\nbirthday; <\/p>\n
\u653e\u5230\u7b2c\u4e00\u4e2a\u5b57\u6bb5：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' first;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(20) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+<\/p>\n
\u63d2\u5165\u65b0\u5b57\u6bb5\u540e，\u5bf9\u539f\u6765\u8868\u4e2d\u7684\u6570\u636e\u6ca1\u6709\u5f71\u54cd：<\/p>\n
mysql> select * from user1;
\n+——+——–+———-+————+————+
\n| id | name | password | birthday | image_path |
\n+——+——–+———-+————+————+
\n| 1 | \u5f20\u4e09 | 12345 | 2005-10-15 | NULL |
\n| 2 | \u674e\u56db | 54321 | 2004-10-15 | NULL |
\n+——+——–+———-+————+————+<\/p>\n
3.3 \u4fee\u6539\u5b57\u6bb5<\/h3>\n\n- \u4fee\u6539 name，\u5c06\u5176\u957f\u5ea6\u6539\u4e3a 60：<\/li>\n<\/ul>\n
alter table user1 modify name varchar(60);
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n5 rows in set (0.00 sec) <\/p>\n
3.4 \u5220\u9664\u5b57\u6bb5<\/h3>\n
\u5220\u9664 password \u5b57\u6bb5：<\/p>\n
alter table user1 drop password;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.5 \u4fee\u6539\u8868\u540d<\/h3>\n\n- \u4fee\u6539\u8868\u540d\u4e3a User1：<\/li>\n<\/ul>\n
alter table user1 rename to User1;
\nalter table user1 rename User1; <\/p>\n
\n- to：\u53ef\u4ee5\u7701\u7565<\/li>\n<\/ul>\n
mysql> show tables;
\n+—————–+
\n| Tables_in_users |
\n+—————–+
\n| User1 |
\n| user2 |
\n+—————–+
\n2 rows in set (0.00 sec) <\/p>\n
3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57<\/h3>\n\n- \u5c06 name \u5b57\u6bb5\u4fee\u6539\u4e3a mz：<\/li>\n<\/ul>\n
alter table User1 change name mz varchar(20); <\/p>\n
\u6ce8\u610f：\u65b0\u5b57\u6bb5\u9700\u8981\u5b8c\u6574\u5b9a\u4e49<\/p>\n
mysql> desc User1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| mz | varchar(20) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.7 \u5220\u9664\u8868<\/h3>\n
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] …<\/p>\n
\u4f8b\u5982：<\/p>\n
drop table user2; <\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55 1. \u521b\u5efa\u8868
\n2. \u67e5\u770b\u8868\u7ed3\u6784
\n3. \u4fee\u6539\u8868
\n3.1 \u63d2\u5165\u6570\u636e
\n3.2 \u6dfb\u52a0\u5b57\u6bb5
\n3.3 \u4fee\u6539\u5b57\u6bb5
\n3.4 \u5220\u9664\u5b57\u6bb5
\n3.5 \u4fee\u6539\u8868\u540d
\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57
\n3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868
\nCREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype
\n) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce;
\nfield \u8868\u793a\u5217\u540ddat<\/p>\n","protected":false},"author":2,"featured_media":94137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-94138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n
MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; field \u8868\u793a\u5217\u540ddat\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-13T12:25:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260813122529-6a7db7b934eb3.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-13T12:25:30+00:00\",\"dateModified\":\"2026-08-13T12:25:30+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/94138.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/94138.html","og_locale":"zh_CN","og_type":"article","og_title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; 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insert into user1 values(1,'\u5f20\u4e09','123456','2005-10-15'),(2,'\u674e\u56db','54321','2004-10-
\n15');<\/p>\n
3.2 \u6dfb\u52a0\u5b57\u6bb5<\/h3>\n\n- \u5728 user1 \u8868\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5，\u7528\u6237\u4fdd\u5b58\u56fe\u7247\u8def\u5f84：<\/li>\n<\/ul>\n
\u653e\u5230 birthday \u5b57\u6bb5\u540e：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' after
\nbirthday; <\/p>\n
\u653e\u5230\u7b2c\u4e00\u4e2a\u5b57\u6bb5：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' first;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(20) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+<\/p>\n
\u63d2\u5165\u65b0\u5b57\u6bb5\u540e，\u5bf9\u539f\u6765\u8868\u4e2d\u7684\u6570\u636e\u6ca1\u6709\u5f71\u54cd：<\/p>\n
mysql> select * from user1;
\n+——+——–+———-+————+————+
\n| id | name | password | birthday | image_path |
\n+——+——–+———-+————+————+
\n| 1 | \u5f20\u4e09 | 12345 | 2005-10-15 | NULL |
\n| 2 | \u674e\u56db | 54321 | 2004-10-15 | NULL |
\n+——+——–+———-+————+————+<\/p>\n
3.3 \u4fee\u6539\u5b57\u6bb5<\/h3>\n\n- \u4fee\u6539 name，\u5c06\u5176\u957f\u5ea6\u6539\u4e3a 60：<\/li>\n<\/ul>\n
alter table user1 modify name varchar(60);
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n5 rows in set (0.00 sec) <\/p>\n
3.4 \u5220\u9664\u5b57\u6bb5<\/h3>\n
\u5220\u9664 password \u5b57\u6bb5：<\/p>\n
alter table user1 drop password;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.5 \u4fee\u6539\u8868\u540d<\/h3>\n\n- \u4fee\u6539\u8868\u540d\u4e3a User1：<\/li>\n<\/ul>\n
alter table user1 rename to User1;
\nalter table user1 rename User1; <\/p>\n
\n- to：\u53ef\u4ee5\u7701\u7565<\/li>\n<\/ul>\n
mysql> show tables;
\n+—————–+
\n| Tables_in_users |
\n+—————–+
\n| User1 |
\n| user2 |
\n+—————–+
\n2 rows in set (0.00 sec) <\/p>\n
3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57<\/h3>\n\n- \u5c06 name \u5b57\u6bb5\u4fee\u6539\u4e3a mz：<\/li>\n<\/ul>\n
alter table User1 change name mz varchar(20); <\/p>\n
\u6ce8\u610f：\u65b0\u5b57\u6bb5\u9700\u8981\u5b8c\u6574\u5b9a\u4e49<\/p>\n
mysql> desc User1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| mz | varchar(20) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.7 \u5220\u9664\u8868<\/h3>\n
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] …<\/p>\n
\u4f8b\u5982：<\/p>\n
drop table user2; <\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55 1. \u521b\u5efa\u8868
\n2. \u67e5\u770b\u8868\u7ed3\u6784
\n3. \u4fee\u6539\u8868
\n3.1 \u63d2\u5165\u6570\u636e
\n3.2 \u6dfb\u52a0\u5b57\u6bb5
\n3.3 \u4fee\u6539\u5b57\u6bb5
\n3.4 \u5220\u9664\u5b57\u6bb5
\n3.5 \u4fee\u6539\u8868\u540d
\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57
\n3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868
\nCREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype
\n) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce;
\nfield \u8868\u793a\u5217\u540ddat<\/p>\n","protected":false},"author":2,"featured_media":94137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-94138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n
MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; field \u8868\u793a\u5217\u540ddat\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-13T12:25:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260813122529-6a7db7b934eb3.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-13T12:25:30+00:00\",\"dateModified\":\"2026-08-13T12:25:30+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/94138.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/94138.html","og_locale":"zh_CN","og_type":"article","og_title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; 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\u653e\u5230 birthday \u5b57\u6bb5\u540e：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' after
\nbirthday; <\/p>\n
\u653e\u5230\u7b2c\u4e00\u4e2a\u5b57\u6bb5：<\/p>\n
alter table users add image_path varchar(100) comment '\u7528\u6237\u5934\u50cf\u8def\u5f84' first;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(20) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+<\/p>\n
\u63d2\u5165\u65b0\u5b57\u6bb5\u540e，\u5bf9\u539f\u6765\u8868\u4e2d\u7684\u6570\u636e\u6ca1\u6709\u5f71\u54cd：<\/p>\n
mysql> select * from user1;
\n+——+——–+———-+————+————+
\n| id | name | password | birthday | image_path |
\n+——+——–+———-+————+————+
\n| 1 | \u5f20\u4e09 | 12345 | 2005-10-15 | NULL |
\n| 2 | \u674e\u56db | 54321 | 2004-10-15 | NULL |
\n+——+——–+———-+————+————+<\/p>\n
3.3 \u4fee\u6539\u5b57\u6bb5<\/h3>\n\n- \u4fee\u6539 name，\u5c06\u5176\u957f\u5ea6\u6539\u4e3a 60：<\/li>\n<\/ul>\n
alter table user1 modify name varchar(60);
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n5 rows in set (0.00 sec) <\/p>\n
3.4 \u5220\u9664\u5b57\u6bb5<\/h3>\n
\u5220\u9664 password \u5b57\u6bb5：<\/p>\n
alter table user1 drop password;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.5 \u4fee\u6539\u8868\u540d<\/h3>\n\n- \u4fee\u6539\u8868\u540d\u4e3a User1：<\/li>\n<\/ul>\n
alter table user1 rename to User1;
\nalter table user1 rename User1; <\/p>\n
\n- to：\u53ef\u4ee5\u7701\u7565<\/li>\n<\/ul>\n
mysql> show tables;
\n+—————–+
\n| Tables_in_users |
\n+—————–+
\n| User1 |
\n| user2 |
\n+—————–+
\n2 rows in set (0.00 sec) <\/p>\n
3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57<\/h3>\n\n- \u5c06 name \u5b57\u6bb5\u4fee\u6539\u4e3a mz：<\/li>\n<\/ul>\n
alter table User1 change name mz varchar(20); <\/p>\n
\u6ce8\u610f：\u65b0\u5b57\u6bb5\u9700\u8981\u5b8c\u6574\u5b9a\u4e49<\/p>\n
mysql> desc User1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| mz | varchar(20) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.7 \u5220\u9664\u8868<\/h3>\n
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] …<\/p>\n
\u4f8b\u5982：<\/p>\n
drop table user2; <\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55 1. \u521b\u5efa\u8868
\n2. \u67e5\u770b\u8868\u7ed3\u6784
\n3. \u4fee\u6539\u8868
\n3.1 \u63d2\u5165\u6570\u636e
\n3.2 \u6dfb\u52a0\u5b57\u6bb5
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\n3.5 \u4fee\u6539\u8868\u540d
\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57
\n3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868
\nCREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype
\n) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce;
\nfield \u8868\u793a\u5217\u540ddat<\/p>\n","protected":false},"author":2,"featured_media":94137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-94138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n
MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; field \u8868\u793a\u5217\u540ddat\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-13T12:25:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260813122529-6a7db7b934eb3.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/94138.html\",\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-13T12:25:30+00:00\",\"dateModified\":\"2026-08-13T12:25:30+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/94138.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/94138.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/94138.html","og_locale":"zh_CN","og_type":"article","og_title":"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; 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alter table user1 modify name varchar(60);
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| password | char(32) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n5 rows in set (0.00 sec) <\/p>\n
3.4 \u5220\u9664\u5b57\u6bb5<\/h3>\n
\u5220\u9664 password \u5b57\u6bb5：<\/p>\n
alter table user1 drop password;
\nmysql> desc user1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| name | varchar(60) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.5 \u4fee\u6539\u8868\u540d<\/h3>\n\n- \u4fee\u6539\u8868\u540d\u4e3a User1：<\/li>\n<\/ul>\n
alter table user1 rename to User1;
\nalter table user1 rename User1; <\/p>\n
\n- to：\u53ef\u4ee5\u7701\u7565<\/li>\n<\/ul>\n
mysql> show tables;
\n+—————–+
\n| Tables_in_users |
\n+—————–+
\n| User1 |
\n| user2 |
\n+—————–+
\n2 rows in set (0.00 sec) <\/p>\n
3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57<\/h3>\n\n- \u5c06 name \u5b57\u6bb5\u4fee\u6539\u4e3a mz：<\/li>\n<\/ul>\n
alter table User1 change name mz varchar(20); <\/p>\n
\u6ce8\u610f：\u65b0\u5b57\u6bb5\u9700\u8981\u5b8c\u6574\u5b9a\u4e49<\/p>\n
mysql> desc User1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| mz | varchar(20) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n
3.7 \u5220\u9664\u8868<\/h3>\n
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] …<\/p>\n
\u4f8b\u5982：<\/p>\n
drop table user2; <\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55 1. \u521b\u5efa\u8868
\n2. \u67e5\u770b\u8868\u7ed3\u6784
\n3. \u4fee\u6539\u8868
\n3.1 \u63d2\u5165\u6570\u636e
\n3.2 \u6dfb\u52a0\u5b57\u6bb5
\n3.3 \u4fee\u6539\u5b57\u6bb5
\n3.4 \u5220\u9664\u5b57\u6bb5
\n3.5 \u4fee\u6539\u8868\u540d
\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57
\n3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868
\nCREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype
\n) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce;
\nfield \u8868\u793a\u5217\u540ddat<\/p>\n","protected":false},"author":2,"featured_media":94137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-94138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n
MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/94138.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL \u8868\u7684\u64cd\u4f5c\uff1a\u8868\u7684\u589e\u5220\u6539 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1. \u521b\u5efa\u8868 2. \u67e5\u770b\u8868\u7ed3\u6784 3. \u4fee\u6539\u8868 3.1 \u63d2\u5165\u6570\u636e 3.2 \u6dfb\u52a0\u5b57\u6bb5 3.3 \u4fee\u6539\u5b57\u6bb5 3.4 \u5220\u9664\u5b57\u6bb5 3.5 \u4fee\u6539\u8868\u540d 3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57 3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868 CREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype ) character set \u5b57\u7b26\u96c6 collate \u6821\u9a8c\u89c4\u5219 engine \u5b58\u50a8\u5f15\u64ce; 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alter table user1 rename to User1;
\nalter table user1 rename User1; <\/p>\n
- \n
- to：\u53ef\u4ee5\u7701\u7565<\/li>\n<\/ul>\n
mysql> show tables;
\n+—————–+
\n| Tables_in_users |
\n+—————–+
\n| User1 |
\n| user2 |
\n+—————–+
\n2 rows in set (0.00 sec) <\/p>\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57<\/h3>\n
- \n
- \u5c06 name \u5b57\u6bb5\u4fee\u6539\u4e3a mz：<\/li>\n<\/ul>\n
alter table User1 change name mz varchar(20); <\/p>\n
\u6ce8\u610f：\u65b0\u5b57\u6bb5\u9700\u8981\u5b8c\u6574\u5b9a\u4e49<\/p>\n
mysql> desc User1;
\n+————+————–+——+—–+———+——-+
\n| Field | Type | Null | Key | Default | Extra |
\n+————+————–+——+—–+———+——-+
\n| id | int | YES | | NULL | |
\n| mz | varchar(20) | YES | | NULL | |
\n| birthday | date | YES | | NULL | |
\n| image_path | varchar(128) | YES | | NULL | |
\n+————+————–+——+—–+———+——-+
\n4 rows in set (0.00 sec)<\/p>\n3.7 \u5220\u9664\u8868<\/h3>\n
DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] …<\/p>\n
\u4f8b\u5982：<\/p>\n
drop table user2; <\/p>\n","protected":false},"excerpt":{"rendered":"
\u76ee\u5f55 1. \u521b\u5efa\u8868
\n2. \u67e5\u770b\u8868\u7ed3\u6784
\n3. \u4fee\u6539\u8868
\n3.1 \u63d2\u5165\u6570\u636e
\n3.2 \u6dfb\u52a0\u5b57\u6bb5
\n3.3 \u4fee\u6539\u5b57\u6bb5
\n3.4 \u5220\u9664\u5b57\u6bb5
\n3.5 \u4fee\u6539\u8868\u540d
\n3.6 \u4fee\u6539\u5b57\u6bb5\u540d\u5b57
\n3.7 \u5220\u9664\u8868 1. \u521b\u5efa\u8868
\nCREATE TABLE table_name (field1 datatype,field2 datatype,field3 datatype
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