![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250428075053-680f335d17ddb.gif\")
<\/p>\n<\/p>\n
🌟\u00a0\u55e8，\u6211\u662fLethehong！🌟<\/p>\n
🌍 \u7acb\u5fd7\u5728\u575a\u4e0d\u6b32\u8bf4，\u6210\u529f\u5728\u4e45\u4e0d\u5728\u901f🌍 <\/p>\n
🚀 \u6b22\u8fce\u5173\u6ce8：👍\u70b9\u8d5e\u2b06\ufe0f\u7559\u8a00\u6536\u85cf🚀<\/p>\n
🍀\u6b22\u8fce\u4f7f\u7528：\u5c0f\u667a\u521d\u5b66\u8ba1\u7b97\u673a\u7f51\u9875IT\u6df1\u5ea6\u77e5\u8bc6\u667a\u80fd\u4f53<\/p>\n
🚀\u4e2a\u4eba\u535a\u5ba2：Lethehong\u6709\u4e00\u8d77\u4e92\u94fe\u7684\u670b\u53cb\u53ef\u4ee5\u79c1\u4fe1\u6211<\/p>\n
\u2705GPT\u4f53\u9a8c\u7801：https:\/\/gitee.com\/lethehong\/chatgpt-share<\/p>\n
\u2705GPT\u4f53\u9a8c\u7801：\u79c1\u4fe1\u535a\u4e3b~\u514d\u8d39\u9886\u53d6\u4f53\u9a8c\u7801<\/p>\n
Lethehong\u8bda\u9080\u60a8\u52a0\u5165\u793e\u7fa4，\u9001\u60a8\u6d77\u91cf\u7f16\u7a0b\u8d44\u6e90，DeepSeek\u8d44\u6599\u5305，\u5404\u79cd\u7ebf\u4e0a\u7ebf\u4e0b\u6d3b\u52a8\u7b49\u4f60\u6765\u5f00\u542f，\u5feb\u6765\u5360\u636e\u4f60\u5f97\u4e00\u5e2d\u4e4b\u5730\u5427！\u00a0<\/p>\n
\u3010\u4eba\u5de5\u667a\u80fd\u6559\u7a0b\u3011\u2014\u2014\u4eba\u5de5\u667a\u80fd\u5b66\u4e60\u8005\u7684\u672a\u6765\u6218\u8230！\u8fd9\u4e2a\u5e73\u53f0\u7528"\u661f\u9645\u63a2\u7d22"\u6a21\u5f0f\u91cd\u6784AI\u6559\u80b2：\u4ece\u673a\u5668\u5b66\u4e60\u57fa\u7840\u5230\u591a\u6a21\u6001\u5927\u6a21\u578b\u5b9e\u6218，\u6bcf\u4e2a\u6280\u672f\u6808\u90fd\u5316\u8eab\u53ef\u4ea4\u4e92\u7684\u592a\u7a7a\u8231\u3002\u4e0a\u5468\u6211\u5728\u300cTransformer\u7a7a\u95f4\u7ad9\u300d\u901a\u8fc7\u4fee\u590d\u5bf9\u8bdd\u7cfb\u7edf\u7684\u6ce8\u610f\u529b\u6f0f\u6d1e，\u7adf\u638c\u63e1\u4e86BERT\u7684\u5fae\u8c03\u7cbe\u9ad3！\u5e73\u53f0\u4e09\u5927\u6838\u5fc3\u5f15\u64ce：<\/p>\n
\u70b9\u51fb\u542f\u822a：\u524d\u8a00 \u2013 \u4eba\u5de5\u667a\u80fd\u6559\u7a0b\u00a0\u2192 \u8ba9\u4f60\u7684AI\u80fd\u529b\u5149\u5e74\u8dc3\u8fc1！\u00a0\u00a0<\/p>\n
\u70ed\u70b9\u65f6\u4e8b\u00a0<\/p>\n
\u661f\u8fb0\u701a\u6d77\u2014\u2014Linux\u79d8\u5883\u4e4b\u64cd\u4f5c\u7cfb\u7edf\u00a0<\/p>\n
Python\u5728\u624b，bug\u6e9c\u8d70！\u7801\u519c\u7684\u5feb\u4e50，\u4f60\u4e0d\u61c2～\u00a0<\/p>\n<\/p>\n
\u76ee\u5f55<\/p>\n
\u4e00\u3001MySQL\u7b80\u4ecb\u4e0e\u7406\u8bba\u57fa\u7840<\/p>\n
\u5173\u7cfb\u578b\u6570\u636e\u5e93\u6838\u5fc3\u6982\u5ff5<\/p>\n
MySQL\u67b6\u6784<\/p>\n
\u5b58\u50a8\u5f15\u64ce<\/p>\n
MySQL\u6570\u636e\u7c7b\u578b<\/p>\n
\u4e8c\u3001\u6570\u636e\u5e93\u548c\u8868\u7684\u57fa\u672c\u64cd\u4f5c<\/p>\n
\u6570\u636e\u5e93\u64cd\u4f5c\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u00a0\u8868\u64cd\u4f5c\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u4e09\u3001\u589e：INSERT \u63d2\u5165\u6570\u636e<\/p>\n
\u63d2\u5165\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/p>\n
\u56db\u3001\u67e5：SELECT \u67e5\u8be2\u6570\u636e<\/p>\n
SELECT\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u6392\u5e8f\u4e0eORDER BY\u5b50\u53e5\u00a0<\/p>\n
\u5206\u7ec4\u548c\u805a\u5408\u51fd\u6570\u00a0<\/p>\n
\u9650\u5236\u7ed3\u679c\u6570\u91cf\u00a0<\/p>\n
\u6a21\u7cca\u67e5\u8be2\u4e0eLIKE\u64cd\u4f5c\u7b26\u00a0<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u67e5\u8be2\u00a0<\/p>\n
\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/p>\n
\u4e94\u3001\u6539：UPDATE \u66f4\u65b0\u6570\u636e<\/p>\n
UPDATE\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u66f4\u65b0\u5355\u4e2a\u8bb0\u5f55\u00a0<\/p>\n
\u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5\u00a0<\/p>\n
\u6761\u4ef6\u66f4\u65b0\u4e0e\u8868\u8fbe\u5f0f\u00a0<\/p>\n
\u591a\u8868\u66f4\u65b0\u00a0<\/p>\n
\u5b9e\u9645\u5e94\u7528\u573a\u666f\u00a0<\/p>\n
\u516d\u3001\u5220：DELETE \u5220\u9664\u6570\u636e<\/p>\n
DELETE\u8bed\u6cd5\u8be6\u89e3<\/p>\n
\u5220\u9664\u7279\u5b9a\u8bb0\u5f55\u00a0<\/p>\n
\u6761\u4ef6\u5220\u9664\u00a0<\/p>\n
\u9650\u5236\u5220\u9664\u6570\u91cf\u00a0<\/p>\n
\u591a\u8868\u5220\u9664\u00a0<\/p>\n
\u6e05\u7a7a\u8868\u00a0<\/p>\n
DELETE\u4e0eTRUNCATE\u7684\u533a\u522b<\/p>\n
\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/p>\n
\u4e03\u3001\u603b\u7ed3<\/p>\n
MySQL\u662f\u4e16\u754c\u4e0a\u6700\u6d41\u884c\u7684\u5f00\u6e90\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e4b\u4e00，\u5e7f\u6cdb\u5e94\u7528\u4e8e\u7f51\u7ad9\u3001\u5e94\u7528\u7a0b\u5e8f\u548c\u4f01\u4e1a\u7ea7\u7cfb\u7edf\u3002\u5b83\u91c7\u7528\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668\u67b6\u6784，\u652f\u6301\u591a\u7528\u6237\u73af\u5883，\u5e76\u57fa\u4e8eSQL（\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00）\u6807\u51c6\u3002<\/p>\n
\u5173\u7cfb\u6a21\u578b：\u6570\u636e\u4ee5\u8868\u683c（\u4e8c\u7ef4\u8868）\u5f62\u5f0f\u5b58\u50a8，\u8868\u4e4b\u95f4\u901a\u8fc7\u5173\u7cfb\u8fde\u63a5<\/p>\n<\/li>\n
ACID\u7279\u6027：<\/p>\n
\u539f\u5b50\u6027(Atomicity)：\u4e8b\u52a1\u4e2d\u7684\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u5b8c\u6210，\u8981\u4e48\u5168\u90e8\u4e0d\u5b8c\u6210<\/p>\n<\/li>\n
\u4e00\u81f4\u6027(Consistency)：\u4e8b\u52a1\u6267\u884c\u524d\u540e，\u6570\u636e\u5e93\u4ece\u4e00\u4e2a\u4e00\u81f4\u72b6\u6001\u53d8\u5230\u53e6\u4e00\u4e2a\u4e00\u81f4\u72b6\u6001<\/p>\n<\/li>\n
\u9694\u79bb\u6027(Isolation)：\u5e76\u53d1\u6267\u884c\u7684\u4e8b\u52a1\u4e4b\u95f4\u4e0d\u4f1a\u4e92\u76f8\u5f71\u54cd<\/p>\n<\/li>\n
\u6301\u4e45\u6027(Durability)：\u4e8b\u52a1\u4e00\u65e6\u63d0\u4ea4，\u5176\u7ed3\u679c\u5c06\u6c38\u4e45\u4fdd\u5b58<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
MySQL\u91c7\u7528\u591a\u5c42\u67b6\u6784\u8bbe\u8ba1：<\/p>\n
\u8fde\u63a5\u5c42：\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42<\/p>\n<\/li>\n
\u670d\u52a1\u5c42：\u5305\u62ec\u67e5\u8be2\u89e3\u6790\u3001\u4f18\u5316\u548c\u7f13\u5b58<\/p>\n<\/li>\n
\u5b58\u50a8\u5f15\u64ce\u5c42：\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u63d0\u53d6<\/p>\n<\/li>\n
\u6587\u4ef6\u7cfb\u7edf\u5c42：\u5c06\u6570\u636e\u6301\u4e45\u5316\u5230\u78c1\u76d8<\/p>\n<\/li>\n
MySQL\u652f\u6301\u591a\u79cd\u5b58\u50a8\u5f15\u64ce，\u6bcf\u79cd\u90fd\u6709\u7279\u5b9a\u7684\u7279\u6027\u548c\u7528\u9014：<\/p>\n
InnoDB：\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce，\u652f\u6301\u4e8b\u52a1\u3001\u5916\u952e\u548c\u884c\u7ea7\u9501<\/p>\n
CREATE TABLE example (id INT) ENGINE=InnoDB;\n <\/li>\n
MyISAM：\u9002\u5408\u8bfb\u5bc6\u96c6\u578b\u5e94\u7528，\u652f\u6301\u5168\u6587\u7d22\u5f15<\/p>\n
CREATE TABLE logs (id INT, message TEXT) ENGINE=MyISAM; <\/li>\n
Memory：\u5c06\u6570\u636e\u5b58\u50a8\u5728\u5185\u5b58\u4e2d，\u901f\u5ea6\u6781\u5feb\u4f46\u4e0d\u6301\u4e45<\/p>\n
CREATE TABLE temp_data (id INT) ENGINE=MEMORY; <\/li>\n
Archive：\u9002\u5408\u5b58\u50a8\u548c\u68c0\u7d22\u5927\u91cf\u5f88\u5c11\u88ab\u67e5\u8be2\u7684\u5386\u53f2\u6570\u636e<\/p>\n
CREATE TABLE old_logs (id INT, log_text TEXT) ENGINE=ARCHIVE; <\/li>\n<\/ul>\n
\u6570\u503c\u7c7b\u578b：<\/p>\n
INT：\u6574\u6570\u7c7b\u578b，4\u5b57\u8282<\/p>\n<\/li>\n
TINYINT：\u5c0f\u6574\u6570，1\u5b57\u8282<\/p>\n<\/li>\n
BIGINT：\u5927\u6574\u6570，8\u5b57\u8282<\/p>\n<\/li>\n
FLOAT\/DOUBLE：\u6d6e\u70b9\u6570<\/p>\n<\/li>\n
DECIMAL：\u7cbe\u786e\u5c0f\u6570<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
\u5b57\u7b26\u4e32\u7c7b\u578b：<\/p>\n
CHAR(n)：\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32<\/p>\n<\/li>\n
VARCHAR(n)：\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32<\/p>\n<\/li>\n
TEXT：\u957f\u6587\u672c<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b：<\/p>\n
DATE：\u65e5\u671f，\u683c\u5f0f'YYYY-MM-DD'<\/p>\n<\/li>\n
TIME：\u65f6\u95f4，\u683c\u5f0f'HH:MM:SS'<\/p>\n<\/li>\n
DATETIME：\u65e5\u671f\u548c\u65f6\u95f4，\u683c\u5f0f'YYYY-MM-DD HH:MM:SS'<\/p>\n<\/li>\n
TIMESTAMP：\u65f6\u95f4\u6233<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
\u5176\u4ed6\u7c7b\u578b：<\/p>\n
ENUM：\u679a\u4e3e\u7c7b\u578b<\/p>\n<\/li>\n
SET：\u96c6\u5408\u7c7b\u578b<\/p>\n<\/li>\n
BLOB：\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
— \u521b\u5efa\u6570\u636e\u5e93
\nCREATE DATABASE [IF NOT EXISTS] mydb
\n[CHARACTER SET charset_name]
\n[COLLATE collation_name];<\/p>\n
— \u67e5\u770b\u6240\u6709\u6570\u636e\u5e93
\nSHOW DATABASES;<\/p>\n
— \u4f7f\u7528\u6570\u636e\u5e93
\nUSE mydb;<\/p>\n
— \u5220\u9664\u6570\u636e\u5e93
\nDROP DATABASE [IF EXISTS] mydb;<\/p>\n
— \u521b\u5efa\u8868
\nCREATE TABLE students (
\n id INT AUTO_INCREMENT PRIMARY KEY, — \u4e3b\u952e，\u81ea\u52a8\u9012\u589e
\n name VARCHAR(50) NOT NULL, — NOT NULL\u7ea6\u675f
\n age INT CHECK (age > 0), — CHECK\u7ea6\u675f
\n gender ENUM('\u7537', '\u5973'), — \u679a\u4e3e\u7c7b\u578b
\n class VARCHAR(20),
\n score FLOAT DEFAULT 0, — \u9ed8\u8ba4\u503c
\n created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, — \u81ea\u52a8\u8bb0\u5f55\u521b\u5efa\u65f6\u95f4
\n INDEX idx_class (class) — \u7d22\u5f15
\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;<\/p>\n
— \u67e5\u770b\u8868\u7ed3\u6784
\nDESCRIBE students;
\n— \u6216
\nSHOW COLUMNS FROM students;<\/p>\n
— \u4fee\u6539\u8868\u7ed3\u6784
\nALTER TABLE students ADD COLUMN email VARCHAR(100);
\nALTER TABLE students MODIFY COLUMN name VARCHAR(100);
\nALTER TABLE students DROP COLUMN email;<\/p>\n
— \u5220\u9664\u8868
\nDROP TABLE [IF EXISTS] students;<\/p>\n
\u57fa\u672c\u8bed\u6cd5：<\/p>\n
INSERT INTO table_name [(column1, column2, …)]
\nVALUES (value1, value2, …)[, (value1, value2, …), …];<\/p>\n
\u63d2\u5165\u5355\u6761\u6570\u636e<\/p>\n
INSERT INTO students (name, age, gender, class, score)
\nVALUES ('\u5f20\u4e09', 20, '\u7537', '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed', 89.5);<\/p>\n
\u63d2\u5165\u591a\u6761\u6570\u636e<\/p>\n
INSERT INTO students (name, age, gender, class, score) VALUES
\n('\u674e\u56db', 19, '\u7537', '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed', 76.0),
\n('\u738b\u4e94', 21, '\u7537', '\u8ba1\u7b97\u673a\u79d1\u5b662\u73ed', 92.5),
\n('\u8d75\u516d', 20, '\u5973', '\u8ba1\u7b97\u673a\u79d1\u5b662\u73ed', 85.0),
\n('\u94b1\u4e03', 22, '\u5973', '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed', 79.5);<\/p>\n
INSERT\u7684\u9ad8\u7ea7\u7528\u6cd5<\/p>\n
— \u63d2\u5165\u6216\u66f4\u65b0（\u5982\u679c\u4e3b\u952e\u5b58\u5728\u5219\u66f4\u65b0）
\nINSERT INTO students (id, name, score)
\nVALUES (1, '\u5f20\u4e09', 95)
\nON DUPLICATE KEY UPDATE score = 95;<\/p>\n
— \u4ece\u5176\u4ed6\u8868\u63d2\u5165\u6570\u636e
\nINSERT INTO students_backup
\nSELECT * FROM students WHERE class = '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed';<\/p>\n
— \u5ffd\u7565\u9519\u8bef\u7ee7\u7eed\u6267\u884c
\nINSERT IGNORE INTO students (id, name, age)
\nVALUES (1, '\u5f20\u4e09', 20);<\/p>\n
\u5f53\u65b0\u5b66\u751f\u5165\u5b66\u65f6，\u9700\u8981\u5c06\u5b66\u751f\u4fe1\u606f\u5f55\u5165\u7cfb\u7edf：<\/p>\n
— \u65b0\u5b66\u671f\u5f00\u59cb，\u6dfb\u52a0\u4e00\u6279\u65b0\u751f
\nINSERT INTO students (name, age, gender, class, score) VALUES
\n('\u5218\u5907', 18, '\u7537', '\u8ba1\u7b97\u673a1\u73ed', NULL), — \u65b0\u751f\u8fd8\u6ca1\u6709\u6210\u7ee9
\n('\u5173\u7fbd', 19, '\u7537', '\u8ba1\u7b97\u673a1\u73ed', NULL),
\n('\u5f20\u98de', 18, '\u7537', '\u8ba1\u7b97\u673a1\u73ed', NULL);<\/p>\n
\u57fa\u672c\u8bed\u6cd5：<\/p>\n
SELECT [DISTINCT] column1, column2, …
\nFROM table_name
\n[JOIN table_name2 ON join_condition]
\n[WHERE condition]
\n[GROUP BY column(s)]
\n[HAVING group_condition]
\n[ORDER BY column(s) [ASC|DESC]]
\n[LIMIT offset, row_count];<\/p>\n
\u67e5\u8be2\u6240\u6709\u8bb0\u5f55<\/p>\n
SELECT * FROM students;<\/p>\n
\u67e5\u8be2\u7279\u5b9a\u5217<\/p>\n
SELECT name, age, score FROM students;<\/p>\n
\u6761\u4ef6\u67e5\u8be2\u4e0eWHERE\u5b50\u53e5\u8be6\u89e3\u00a0<\/p>\n
— \u67e5\u8be2\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed\u7684\u5b66\u751f
\nSELECT * FROM students WHERE class = '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed';<\/p>\n
— \u67e5\u8be2\u6210\u7ee9\u5927\u4e8e80\u7684\u5b66\u751f
\nSELECT name, score FROM students WHERE score > 80;<\/p>\n
— \u67e5\u8be2\u5e74\u9f84\u572819\u523021\u5c81\u4e4b\u95f4\u7684\u5b66\u751f
\nSELECT * FROM students WHERE age BETWEEN 19 AND 21;<\/p>\n
— \u590d\u5408\u6761\u4ef6：AND, OR, NOT
\nSELECT * FROM students
\nWHERE (class = '\u8ba1\u7b97\u673a\u79d1\u5b661\u73ed' OR class = '\u8ba1\u7b97\u673a\u79d1\u5b662\u73ed')
\nAND score >= 80
\nAND NOT gender = '\u5973';<\/p>\n
— NULL\u503c\u5904\u7406
\nSELECT * FROM students WHERE score IS NULL;
\nSELECT * FROM students WHERE score IS NOT NULL;<\/p>\n
— \u6309\u6210\u7ee9\u964d\u5e8f\u6392\u5217
\nSELECT * FROM students ORDER BY score DESC;<\/p>\n
— \u5148\u6309\u73ed\u7ea7\u5347\u5e8f，\u518d\u6309\u6210\u7ee9\u964d\u5e8f
\nSELECT * FROM students ORDER BY class ASC, score DESC;<\/p>\n
— \u6309\u5b57\u6bb5\u4f4d\u7f6e\u6392\u5e8f（\u4e0d\u63a8\u8350，\u4f46\u9700\u4e86\u89e3）
\nSELECT name, age, score FROM students ORDER BY 3 DESC; — \u6309\u7b2c3\u5217(score)\u6392\u5e8f<\/p>\n
— \u8ba1\u7b97\u6bcf\u4e2a\u73ed\u7ea7\u7684\u5e73\u5747\u5206
\nSELECT class, AVG(score) as avg_score FROM students GROUP BY class;<\/p>\n
— \u67e5\u627e\u6bcf\u4e2a\u73ed\u7ea7\u7684\u6700\u9ad8\u5206\u548c\u6700\u4f4e\u5206
\nSELECT
\n class,
\n MAX(score) as highest_score,
\n MIN(score) as lowest_score,
\n COUNT(*) as student_count,
\n SUM(score) as total_score,
\n STDDEV(score) as score_deviation — \u6807\u51c6\u5dee
\nFROM students
\nWHERE score IS NOT NULL
\nGROUP BY class;<\/p>\n
— HAVING\u5b50\u53e5（\u5bf9\u5206\u7ec4\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009）
\nSELECT class, AVG(score) as avg_score
\nFROM students
\nGROUP BY class
\nHAVING avg_score > 80;<\/p>\n
— \u67e5\u8be2\u524d3\u540d\u5b66\u751f
\nSELECT * FROM students ORDER BY score DESC LIMIT 3;<\/p>\n
— \u5206\u9875\u67e5\u8be2：\u6bcf\u98755\u6761，\u67e5\u8be2\u7b2c2\u9875
\nSELECT * FROM students LIMIT 5, 5; — \u504f\u79fb\u91cf5，\u8fd4\u56de5\u6761
\n— \u6216\u4f7f\u7528\u66f4\u73b0\u4ee3\u7684\u8bed\u6cd5
\nSELECT * FROM students LIMIT 5 OFFSET 5;<\/p>\n
— \u67e5\u8be2\u540d\u5b57\u4e2d\u5305\u542b"\u5f20"\u7684\u5b66\u751f
\nSELECT * FROM students WHERE name LIKE '%\u5f20%';<\/p>\n
— \u67e5\u8be2\u4ee5"\u8ba1\u7b97\u673a"\u5f00\u5934\u7684\u73ed\u7ea7
\nSELECT DISTINCT class FROM students WHERE class LIKE '\u8ba1\u7b97\u673a%';<\/p>\n
— \u901a\u914d\u7b26\u8bf4\u660e
\n— %：\u5339\u914d\u4efb\u610f\u6570\u91cf\u7684\u5b57\u7b26
\n— _：\u5339\u914d\u5355\u4e2a\u5b57\u7b26
\nSELECT * FROM students WHERE name LIKE '\u5f20_'; — \u5339\u914d"\u5f20"\u540e\u8ddf\u4e00\u4e2a\u5b57\u7b26\u7684\u540d\u5b57<\/p>\n
— \u67e5\u8be2\u540d\u5b57\u4e2d\u5305\u542b\u6570\u5b57\u7684\u5b66\u751f
\nSELECT * FROM students WHERE name REGEXP '[0-9]';<\/p>\n
— \u67e5\u8be2\u540d\u5b57\u4ee5"\u5f20"\u6216"\u738b"\u5f00\u5934\u7684\u5b66\u751f
\nSELECT * FROM students WHERE name REGEXP '^[\u5f20\u738b]';<\/p>\n
\u671f\u672b\u8003\u8bd5\u540e，\u6559\u5e08\u9700\u8981\u7edf\u8ba1\u73ed\u7ea7\u60c5\u51b5：<\/p>\n
— \u67e5\u8be2\u6bcf\u4e2a\u73ed\u7ea7\u7684\u53ca\u683c\u7387
\nSELECT
\n class,
\n COUNT(*) as total_students,
\n SUM(CASE WHEN score >= 60 THEN 1 ELSE 0 END) as passed_students,
\n ROUND(SUM(CASE WHEN score >= 60 THEN 1 ELSE 0 END) \/ COUNT(*) * 100, 2) as pass_rate
\nFROM students
\nWHERE score IS NOT NULL
\nGROUP BY class;<\/p>\n
\u57fa\u672c\u8bed\u6cd5：<\/p>\n
UPDATE table_name
\nSET column1 = value1, column2 = value2, …
\n[WHERE condition]
\n[ORDER BY …]
\n[LIMIT row_count];<\/p>\n
— \u66f4\u65b0\u5f20\u4e09\u7684\u6210\u7ee9
\nUPDATE students SET score = 92.0 WHERE name = '\u5f20\u4e09';<\/p>\n
— \u674e\u56db\u8f6c\u73ed\u5e76\u66f4\u65b0\u4fe1\u606f
\nUPDATE students
\nSET class = '\u8ba1\u7b97\u673a\u79d1\u5b662\u73ed', age = 20
\nWHERE name = '\u674e\u56db';<\/p>\n
— \u7ed9\u6240\u670990\u5206\u4ee5\u4e0a\u7684\u5b66\u751f\u52a05\u5206\u5956\u52b1（\u4f46\u4e0d\u8d85\u8fc7100\u5206）
\nUPDATE students
\nSET score = LEAST(score + 5, 100)
\nWHERE score > 90;<\/p>\n
— \u6240\u6709\u5b66\u751f\u5e74\u9f84\u589e\u52a01\u5c81
\nUPDATE students SET age = age + 1;<\/p>\n
— \u4f7f\u7528CASE\u8868\u8fbe\u5f0f\u8fdb\u884c\u6761\u4ef6\u66f4\u65b0
\nUPDATE students
\nSET score = CASE
\n WHEN score < 60 THEN score + 5 — \u4e0d\u53ca\u683c\u52a05\u5206
\n WHEN score >= 60 AND score < 90 THEN score + 3 — \u826f\u597d\u52a03\u5206
\n ELSE score — \u4f18\u79c0\u4e0d\u53d8
\nEND;<\/p>\n
— \u57fa\u4e8e\u53e6\u4e00\u4e2a\u8868\u7684\u6570\u636e\u66f4\u65b0\u5f53\u524d\u8868
\nUPDATE students s
\nJOIN student_extra_info sei ON s.id = sei.student_id
\nSET s.email = sei.email, s.phone = sei.phone
\nWHERE sei.update_flag = 1;<\/p>\n
\u671f\u4e2d\u8003\u8bd5\u540e，\u67d0\u4e9b\u5b66\u751f\u53c2\u52a0\u4e86\u8865\u8003，\u9700\u8981\u66f4\u65b0\u6210\u7ee9：<\/p>\n
— \u6279\u91cf\u66f4\u65b0\u8865\u8003\u6210\u7ee9
\nUPDATE students
\nSET score = CASE
\n WHEN name = '\u674e\u56db' THEN 82.5
\n WHEN name = '\u94b1\u4e03' THEN 88.0
\n ELSE score
\nEND
\nWHERE name IN ('\u674e\u56db', '\u94b1\u4e03');<\/p>\n
\u57fa\u672c\u8bed\u6cd5：<\/p>\n
DELETE FROM table_name
\n[WHERE condition]
\n[ORDER BY …]
\n[LIMIT row_count];<\/p>\n
— \u5220\u9664\u6307\u5b9a\u5b66\u751f
\nDELETE FROM students WHERE name = '\u8d75\u516d';<\/p>\n
— \u5220\u9664\u6210\u7ee9\u4e0d\u53ca\u683c\u7684\u5b66\u751f
\nDELETE FROM students WHERE score < 60;<\/p>\n
— \u5220\u9664\u6210\u7ee9\u6700\u4f4e\u76843\u540d\u5b66\u751f
\nDELETE FROM students
\nORDER BY score ASC
\nLIMIT 3;<\/p>\n
— \u5220\u9664\u5df2\u7ecf\u5728\u6bd5\u4e1a\u751f\u8868\u4e2d\u7684\u5b66\u751f
\nDELETE s FROM students s
\nJOIN graduated_students g ON s.id = g.student_id;<\/p>\n
— \u5220\u9664\u8868\u4e2d\u6240\u6709\u6570\u636e（\u9010\u884c\u5220\u9664，\u53ef\u56de\u6eda）
\nDELETE FROM students;<\/p>\n
— \u6216\u8005（\u76f4\u63a5\u5220\u9664\u8868\u5e76\u91cd\u5efa，\u6548\u7387\u66f4\u9ad8，\u4e0d\u53ef\u56de\u6eda）
\nTRUNCATE TABLE students;<\/p>\n
\u4e8b\u52a1\u652f\u6301：DELETE\u652f\u6301\u4e8b\u52a1\u56de\u6eda，TRUNCATE\u4e0d\u652f\u6301<\/p>\n<\/li>\n
\u901f\u5ea6：TRUNCATE\u901a\u5e38\u66f4\u5feb<\/p>\n<\/li>\n
\u81ea\u589e\u503c：TRUNCATE\u4f1a\u91cd\u7f6eAUTO_INCREMENT\u8ba1\u6570\u5668<\/p>\n<\/li>\n
\u89e6\u53d1\u5668：DELETE\u4f1a\u89e6\u53d1DELETE\u89e6\u53d1\u5668，TRUNCATE\u4e0d\u4f1a<\/p>\n<\/li>\n
\u5b66\u671f\u7ed3\u675f，\u9700\u8981\u6e05\u7406\u4e34\u65f6\u5b66\u751f\u6570\u636e：<\/p>\n
— \u5220\u9664\u5df2\u7ecf\u6bd5\u4e1a\u7684\u5b66\u751f
\nDELETE FROM students WHERE id IN (
\n SELECT id FROM graduated_students
\n);<\/p>\n
— \u5047\u8bbe\u8981\u5220\u9664\u65e7\u5b66\u671f\u7684\u6570\u636e\u5e76\u4fdd\u7559\u65b0\u5b66\u671f\u6570\u636e
\n— \u521b\u5efa\u5907\u4efd
\nCREATE TABLE students_new_semester AS
\nSELECT * FROM students WHERE entry_year = 2025;<\/p>\n
— \u6e05\u7a7a\u539f\u8868
\nTRUNCATE TABLE students;<\/p>\n
— \u5c06\u65b0\u6570\u636e\u63d2\u56de\u539f\u8868
\nINSERT INTO students
\nSELECT * FROM students_new_semester;<\/p>\n
— \u5220\u9664\u4e34\u65f6\u8868
\nDROP TABLE students_new_semester;<\/p>\n
\u8fd9\u7bc7\u6587\u7ae0\u5168\u9762\u4ecb\u7ecd\u4e86MySQL\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u6838\u5fc3\u77e5\u8bc6，\u6db5\u76d6\u4e86MySQL\u7684\u57fa\u7840\u7406\u8bba\u3001\u67b6\u6784\u548c\u5b58\u50a8\u5f15\u64ce，\u4ee5\u53ca\u6570\u636e\u5e93\u4e0e\u8868\u7684\u57fa\u672c\u64cd\u4f5c（\u521b\u5efa\u3001\u67e5\u770b\u3001\u4fee\u6539\u3001\u5220\u9664）\u3002\u6587\u7ae0\u7cfb\u7edf\u5730\u8bb2\u89e3\u4e86SQL\u7684\u56db\u5927\u64cd\u4f5c：INSERT（\u6570\u636e\u63d2\u5165）\u3001SELECT（\u6570\u636e\u67e5\u8be2，\u5305\u62ec\u6761\u4ef6\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u3001\u805a\u5408\u7b49\u9ad8\u7ea7\u529f\u80fd）\u3001UPDATE（\u6570\u636e\u66f4\u65b0）\u548cDELETE（\u6570\u636e\u5220\u9664），\u5e76\u4e3a\u6bcf\u79cd\u64cd\u4f5c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u8bed\u6cd5\u793a\u4f8b\u548c\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002\u8fd9\u662f\u4e00\u4efd\u9002\u5408\u4ece\u5165\u95e8\u5230\u8fdb\u9636\u7684MySQL\u5b66\u4e60\u6307\u5357，\u7ed3\u6784\u6e05\u6670，\u5b9e\u4f8b\u4e30\u5bcc，\u65e2\u5305\u542b\u4e86\u8bed\u6cd5\u8be6\u89e3，\u53c8\u7ed3\u5408\u4e86\u5b9e\u9645\u573a\u666f\u5e94\u7528，\u5bf9\u4e8e\u6570\u636e\u5e93\u521d\u5b66\u8005\u548c\u9700\u8981\u67e5\u9605\u53c2\u8003\u7684\u5f00\u53d1\u8005\u90fd\u5177\u6709\u5f88\u9ad8\u7684\u5b9e\u7528\u4ef7\u503c\u3002<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250428075053-680f335d3f49c.gif\")
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb982\u6b21\uff0c\u70b9\u8d5e71\u6b21\uff0c\u6536\u85cf61\u6b21\u3002\u8fd9\u7bc7\u6587\u7ae0\u5168\u9762\u4ecb\u7ecd\u4e86MySQL\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u6838\u5fc3\u77e5\u8bc6\uff0c\u6db5\u76d6\u4e86MySQL\u7684\u57fa\u7840\u7406\u8bba\u3001\u67b6\u6784\u548c\u5b58\u50a8\u5f15\u64ce\uff0c\u4ee5\u53ca\u6570\u636e\u5e93\u4e0e\u8868\u7684\u57fa\u672c\u64cd\u4f5c\uff08\u521b\u5efa\u3001\u67e5\u770b\u3001\u4fee\u6539\u3001\u5220\u9664\uff09\u3002\u6587\u7ae0\u7cfb\u7edf\u5730\u8bb2\u89e3\u4e86SQL\u7684\u56db\u5927\u64cd\u4f5c\uff1aINSERT\uff08\u6570\u636e\u63d2\u5165\uff09\u3001SELECT\uff08\u6570\u636e\u67e5\u8be2\uff0c\u5305\u62ec\u6761\u4ef6\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u3001\u805a\u5408\u7b49\u9ad8\u7ea7\u529f\u80fd\uff09\u3001UPDATE\uff08\u6570\u636e\u66f4\u65b0\uff09\u548cDELETE\uff08\u6570\u636e\u5220\u9664\uff09\uff0c\u5e76\u4e3a\u6bcf\u79cd\u64cd\u4f5c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u8bed\u6cd5\u793a\u4f8b\u548c\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002\u8fd9\u662f\u4e00\u4efd\u9002\u5408\u4ece\u5165\u95e8\u5230\u8fdb\u9636\u7684MySQL\u5b66\u4e60\u6307\u5357\uff0c\u7ed3\u6784\u6e05\u6670\uff0c\u5b9e\u4f8b\u4e30\u5bcc\uff0c\u65e2\u5305\u542b\u4e86\u8bed\u6cd5\u8be6\u89e3\uff0c\u53c8\u7ed3\u5408\u4e86\u5b9e\u9645\u573a\u666f\u5e94\u7528\uff0c\u5bf9\u4e8e\u6570\u636e\u5e93\u521d\u5b66\u8005\u548c\u9700\u8981\u67e5\u9605\u53c2\u8003\u7684<\/p>\n","protected":false},"author":2,"featured_media":33869,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-33871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n