{"id":58901,"date":"2025-08-16T17:49:52","date_gmt":"2025-08-16T09:49:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58901.html"},"modified":"2025-08-16T17:49:52","modified_gmt":"2025-08-16T09:49:52","slug":"sql%e5%86%99%e6%b3%95%e7%a6%81%e5%bf%8c%ef%bc%9a%e8%bf%99%e4%ba%9b%e8%af%ad%e6%b3%95%e5%9c%a8mysql-oracle%e4%b8%ad%e9%83%bd%e6%98%af%e6%80%a7%e8%83%bd%e6%af%92%e8%8d%af%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58901.html","title":{"rendered":"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01"},"content":{"rendered":"<p>\u672c\u4eba\u8be6\u89e3 \u4f5c\u8005\uff1a\u738b\u6587\u5cf0\uff0c\u53c2\u52a0\u8fc7 CSDN 2020\u5e74\u5ea6\u535a\u5ba2\u4e4b\u661f\uff0c\u300aJava\u738b\u5927\u5e08\u738b\u5929\u5e08\u300b \u516c\u4f17\u53f7\uff1aJAVA\u5f00\u53d1\u738b\u5927\u5e08\uff0c\u4e13\u6ce8\u4e8e\u5929\u9053\u916c\u52e4\u7684 Java \u5f00\u53d1\u95ee\u9898\u4e2d\u56fd\u56fd\u5b66\u3001\u4f20\u7edf\u6587\u5316\u548c\u4ee3\u7801\u7231\u597d\u8005\u7684\u7a0b\u5e8f\u4eba\u751f\uff0c\u671f\u5f85\u4f60\u7684\u5173\u6ce8\u548c\u652f\u6301\uff01\u672c\u4eba\u5916\u53f7\uff1a\u795e\u79d8\u5c0f\u5cef \u5c71\u5cef  \u8f6c\u8f7d\u8bf4\u660e\uff1a\u52a1\u5fc5\u6ce8\u660e\u6765\u6e90\uff08\u6ce8\u660e\uff1a\u4f5c\u8005\uff1a\u738b\u6587\u5cf0\u54e6\uff09<\/p>\n<\/p>\n<h4><font color=\"#12a\">SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01<\/font><\/h4>\n<ul>\n<li><font color=\"#aa12\">\u5b66\u4e60\u6559\u7a0b\uff08\u4f20\u9001\u95e8\uff09<\/font><\/li>\n<li>\n<ul>\n<li>SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001SELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\uff08\u53cd\u590d\u6267\u884c\u9677\u9631\uff09<\/li>\n<li>\u4e8c\u3001\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff08\u7d22\u5f15\u5931\u6548\u5143\u51f6\uff09<\/li>\n<li>\u4e09\u3001\u5bf9\u7d22\u5f15\u5217\u4f7f\u7528\u51fd\u6570\uff08\u7d22\u5f15\u6740\u624b\uff09<\/li>\n<li>\u56db\u3001N+1\u67e5\u8be2\u95ee\u9898\uff08ORM\u6846\u67b6\u91cd\u707e\u533a\uff09<\/li>\n<li>\u4e94\u3001\u8fc7\u5ea6\u4f7f\u7528OR\u6761\u4ef6\uff08\u7d22\u5f15\u77ed\u8def\uff09<\/li>\n<li>\u516d\u3001\u65e0\u9650\u5236SELECT *\uff08\u6570\u636e\u4f20\u8f93\u707e\u96be\uff09<\/li>\n<li>\ud83d\udee0 \u6027\u80fd\u4f18\u5316\u9ec4\u91d1\u6cd5\u5219<\/li>\n<li>\u6027\u80fd\u4f18\u5316\u524d\u540e\u5bf9\u6bd4\uff08TPC-H 10G\u6570\u636e\u6d4b\u8bd5\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><font color=\"#aa12\">\u5b66\u4e60\u6559\u7a0b\uff08\u4f20\u9001\u95e8\uff09<\/font><\/li>\n<li><font color=\"#56aaa\">\u5f80\u671f\u6587\u7ae0<\/font><\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816094949-68a0543d9a6a5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n<h2><font color=\"#aa12\">\u5b66\u4e60\u6559\u7a0b\uff08\u4f20\u9001\u95e8\uff09<\/font><\/h2>\n<p>1\u3001\u638c\u63e1 JAVA\u5165\u95e8\u5230\u8fdb\u9636\u77e5\u8bc6(<font color=\"blue\">\u6301\u7eed\u5199\u4f5c\u4e2d\u2026\u2026<\/font>\uff09 2\u3001\u5b66\u4f1aOracle\u6570\u636e\u5e93\u7528\u6cd5(<font color=\"red\">\u521b\u4f5c\u4e2d\u2026\u2026<\/font>\uff09 3\u3001\u624b\u628a\u624b\u6559\u4f60vbs\u811a\u672c\u5236\u4f5c(<font color=\"red\">\u5b8c\u5584\u4e2d\u2026\u2026<\/font>\uff09 4\u3001\u725b\u903c\u54c4\u54c4\u7684 IDEA\u7f16\u7a0b\u5229\u5668(<font color=\"#4ascd12\">\u7f16\u5199\u4e2d\u2026\u2026<\/font>\uff09 5\u3001\u5410\u8840\u6574\u7406\u7684 \u9762\u8bd5\u6280\u5de7(<font color=\"red\">\u66f4\u65b0\u4e2d\u2026\u2026<\/font>\uff09<\/p>\n<h3>SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01<\/h3>\n<p>\u4f60\u662f\u5426\u66fe\u5728\u6df1\u591c\u6536\u5230\u6570\u636e\u5e93\u544a\u8b66\uff0c\u53d1\u73b0\u4e00\u6761SQL\u62d6\u57ae\u4e86\u6574\u4e2a\u7cfb\u7edf\uff1f\u672c\u6587\u63ed\u793a\u516d\u5927\u5e38\u89c1SQL\u6027\u80fd\u9677\u9631\uff0c\u9644\u8d60\u4f18\u5316\u65b9\u6848\uff0c\u8ba9\u4f60\u7684\u67e5\u8be2\u6548\u7387\u63d0\u5347\u5341\u500d\uff01<\/p>\n<p>\u5728\u6570\u636e\u5e93\u5f00\u53d1\u4e2d\uff0c\u8bed\u6cd5\u6b63\u786e \u2260 \u6027\u80fd\u4f18\u826f\u3002\u8bb8\u591a\u770b\u4f3c\u65e0\u5bb3\u7684\u5199\u6cd5\uff0c\u5728\u6570\u636e\u91cf\u589e\u957f\u65f6\u4f1a\u6210\u4e3a\u7cfb\u7edf\u7684\u81f4\u547d\u74f6\u9888\u3002\u4ee5\u4e0b\u662f\u6211\u5728MySQL\u548cOracle\u4f18\u5316\u5b9e\u8df5\u4e2d\u603b\u7ed3\u7684\u516d\u5927\u6027\u80fd\u6bd2\u836f\uff1a<\/p>\n<h4>\u4e00\u3001SELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\uff08\u53cd\u590d\u6267\u884c\u9677\u9631\uff09<\/h4>\n<p><span class=\"token comment\">&#8212; \ud83d\udeab \u9519\u8bef\u5199\u6cd5\uff08MySQL\/Oracle\u5747\u53d7\u5f71\u54cd\uff09<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span><br \/>\n    order_id<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">SELECT<\/span> customer_name <span class=\"token keyword\">FROM<\/span> customers c <span class=\"token keyword\">WHERE<\/span> c<span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">=<\/span> o<span class=\"token punctuation\">.<\/span>customer_id<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">AS<\/span> name<br \/>\n<span class=\"token keyword\">FROM<\/span> orders o<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u95ee\u9898\u5206\u6790\uff1a \u6b64\u5199\u6cd5\u4f1a\u5bfc\u81f4\u5b50\u67e5\u8be2\u5bf9\u4e3b\u67e5\u8be2\u7684\u6bcf\u6761\u8bb0\u5f55\u6267\u884c\u4e00\u6b21\u3002\u82e5orders\u8868\u670910\u4e07\u6570\u636e\uff0c\u5b50\u67e5\u8be2\u5c06\u6267\u884c10\u4e07\u6b21\uff01<\/p>\n<p>\u2705 \u4f18\u5316\u65b9\u6848 \u2192 \u4f7f\u7528JOIN\u6539\u5199\uff1a<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> o<span class=\"token punctuation\">.<\/span>order_id<span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">.<\/span>customer_name <span class=\"token keyword\">AS<\/span> name<br \/>\n<span class=\"token keyword\">FROM<\/span> orders o<br \/>\n<span class=\"token keyword\">JOIN<\/span> customers c <span class=\"token keyword\">ON<\/span> o<span class=\"token punctuation\">.<\/span>customer_id <span class=\"token operator\">=<\/span> c<span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u4e8c\u3001\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff08\u7d22\u5f15\u5931\u6548\u5143\u51f6\uff09<\/h4>\n<p><span class=\"token comment\">&#8212; \ud83d\udeab \u9519\u8bef\u793a\u4f8b\uff08\u5e38\u89c1\u4e8e\u5b57\u7b26\u4e32\/\u6570\u5b57\u6df7\u7528\uff09<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> user_logs<br \/>\n<span class=\"token keyword\">WHERE<\/span> user_id <span class=\"token operator\">=<\/span> <span class=\"token string\">\\&#8217;1001\\&#8217;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">&#8212; user_id\u662f\u6570\u503c\u7c7b\u578b<\/span><\/p>\n<p>\u95ee\u9898\u5206\u6790<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb222\u6b21\uff0c\u70b9\u8d5e6\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u672c\u6587\u603b\u7ed3\u4e86MySQL\/Oracle\u4e2d\u516d\u5927\u5e38\u89c1SQL\u6027\u80fd\u9677\u9631\u53ca\u4f18\u5316\u65b9\u6848\uff1a1\uff09\u907f\u514dSELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\uff0c\u6539\u7528JOIN\uff1b2\uff09\u9632\u6b62\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff1b3\uff09\u4e0d\u5bf9\u7d22\u5f15\u5217\u4f7f\u7528\u51fd\u6570\uff1b4\uff09\u89e3\u51b3ORM\u6846\u67b6\u7684N+1\u67e5\u8be2\u95ee\u9898\uff1b5\uff09\u7528UNION ALL\u66ff\u4ee3OR\u6761\u4ef6\uff1b6\uff09\u907f\u514d\u65e0\u9650\u5236SELECT *\u3002\u6587\u7ae0\u8fd8\u63d0\u4f9b\u4e86\u6267\u884c\u8ba1\u5212\u5206\u6790\u3001\u7d22\u5f15\u4f7f\u7528\u539f\u5219\u548c\u5206\u9875\u4f18\u5316\u6280\u5de7\uff0c\u901a\u8fc7\u5b9e\u9645\u6848\u4f8b\u5bf9\u6bd4\u663e\u793a\u4f18\u5316\u540e\u6027\u80fd\u53ef\u63d0\u534730-50\u500d\u3002\u4f5c\u8005\u738b\u6587\u5cf0\u662fCSDN\u535a\u5ba2\u4e13\u5bb6\uff0c\u4e13\u6ce8Java\u5f00\u53d1\u548c\u6570\u636e\u5e93\u4f18\u5316\u3002<\/p>\n","protected":false},"author":2,"featured_media":58900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,604,768],"topic":[],"class_list":["post-58901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-oracle","tag-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \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\/58901.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb222\u6b21\uff0c\u70b9\u8d5e6\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u672c\u6587\u603b\u7ed3\u4e86MySQL\/Oracle\u4e2d\u516d\u5927\u5e38\u89c1SQL\u6027\u80fd\u9677\u9631\u53ca\u4f18\u5316\u65b9\u6848\uff1a1\uff09\u907f\u514dSELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\uff0c\u6539\u7528JOIN\uff1b2\uff09\u9632\u6b62\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff1b3\uff09\u4e0d\u5bf9\u7d22\u5f15\u5217\u4f7f\u7528\u51fd\u6570\uff1b4\uff09\u89e3\u51b3ORM\u6846\u67b6\u7684N+1\u67e5\u8be2\u95ee\u9898\uff1b5\uff09\u7528UNION ALL\u66ff\u4ee3OR\u6761\u4ef6\uff1b6\uff09\u907f\u514d\u65e0\u9650\u5236SELECT *\u3002\u6587\u7ae0\u8fd8\u63d0\u4f9b\u4e86\u6267\u884c\u8ba1\u5212\u5206\u6790\u3001\u7d22\u5f15\u4f7f\u7528\u539f\u5219\u548c\u5206\u9875\u4f18\u5316\u6280\u5de7\uff0c\u901a\u8fc7\u5b9e\u9645\u6848\u4f8b\u5bf9\u6bd4\u663e\u793a\u4f18\u5316\u540e\u6027\u80fd\u53ef\u63d0\u534730-50\u500d\u3002\u4f5c\u8005\u738b\u6587\u5cf0\u662fCSDN\u535a\u5ba2\u4e13\u5bb6\uff0c\u4e13\u6ce8Java\u5f00\u53d1\u548c\u6570\u636e\u5e93\u4f18\u5316\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/58901.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-16T09:49:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816094949-68a0543d9a6a5.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<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/58901.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/58901.html\",\"name\":\"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2025-08-16T09:49:52+00:00\",\"dateModified\":\"2025-08-16T09:49:52+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/58901.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/58901.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/58901.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01\"}]},{\"@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":"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \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\/58901.html","og_locale":"zh_CN","og_type":"article","og_title":"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb222\u6b21\uff0c\u70b9\u8d5e6\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u672c\u6587\u603b\u7ed3\u4e86MySQL\/Oracle\u4e2d\u516d\u5927\u5e38\u89c1SQL\u6027\u80fd\u9677\u9631\u53ca\u4f18\u5316\u65b9\u6848\uff1a1\uff09\u907f\u514dSELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\uff0c\u6539\u7528JOIN\uff1b2\uff09\u9632\u6b62\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff1b3\uff09\u4e0d\u5bf9\u7d22\u5f15\u5217\u4f7f\u7528\u51fd\u6570\uff1b4\uff09\u89e3\u51b3ORM\u6846\u67b6\u7684N+1\u67e5\u8be2\u95ee\u9898\uff1b5\uff09\u7528UNION ALL\u66ff\u4ee3OR\u6761\u4ef6\uff1b6\uff09\u907f\u514d\u65e0\u9650\u5236SELECT *\u3002\u6587\u7ae0\u8fd8\u63d0\u4f9b\u4e86\u6267\u884c\u8ba1\u5212\u5206\u6790\u3001\u7d22\u5f15\u4f7f\u7528\u539f\u5219\u548c\u5206\u9875\u4f18\u5316\u6280\u5de7\uff0c\u901a\u8fc7\u5b9e\u9645\u6848\u4f8b\u5bf9\u6bd4\u663e\u793a\u4f18\u5316\u540e\u6027\u80fd\u53ef\u63d0\u534730-50\u500d\u3002\u4f5c\u8005\u738b\u6587\u5cf0\u662fCSDN\u535a\u5ba2\u4e13\u5bb6\uff0c\u4e13\u6ce8Java\u5f00\u53d1\u548c\u6570\u636e\u5e93\u4f18\u5316\u3002","og_url":"https:\/\/www.wsisp.com\/helps\/58901.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2025-08-16T09:49:52+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816094949-68a0543d9a6a5.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/58901.html","url":"https:\/\/www.wsisp.com\/helps\/58901.html","name":"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2025-08-16T09:49:52+00:00","dateModified":"2025-08-16T09:49:52+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/58901.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/58901.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/58901.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"SQL\u5199\u6cd5\u7981\u5fcc\uff1a\u8fd9\u4e9b\u8bed\u6cd5\u5728MySQL\/Oracle\u4e2d\u90fd\u662f\u6027\u80fd\u6bd2\u836f\uff01"}]},{"@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"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/58901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=58901"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/58901\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/58900"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=58901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=58901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=58901"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=58901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}