{"id":144011,"date":"2024-11-01T03:07:21","date_gmt":"2024-10-31T19:07:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144011\/"},"modified":"2024-11-01T03:07:21","modified_gmt":"2024-10-31T19:07:21","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%9d%a2%e8%a9%a6%ef%bc%9a%e5%95%8f%e9%a1%8c%e8%88%87%e8%a7%a3%e7%ad%94-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%9d%a2%e8%a9%a6%e5%b8%b8%e8%a6%8b%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144011\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u9762\u8a66\uff1a\u554f\u984c\u8207\u89e3\u7b54 (sql \u6578\u64da\u5eab\u9762\u8a66\u5e38\u898b\u554f\u984c)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%9d%a2%e8%a9%a6%ef%bc%9a%e5%95%8f%e9%a1%8c%e8%88%87%e8%a7%a3%e7%ad%94-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%9d%a2%e8%a9%a6%e5%b8%b8%e8%a6%8b%e5%95%8f%e9%a1%8c-mJquInyHDx\">SQL \u6578\u64da\u5eab\u9762\u8a66\uff1a\u554f\u984c\u8207\u89e3\u7b54 (SQL \u6578\u64da\u5eab\u9762\u8a66\u5e38\u898b\u554f\u984c)<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u79d1\u6280\u74b0\u5883\u4e2d\uff0cSQL \u6578\u64da\u5eab\u7684\u77e5\u8b58\u5c0d\u65bc\u8a31\u591a IT \u8077\u4f4d\u4f86\u8aaa\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u7121\u8ad6\u662f\u6578\u64da\u5206\u6790\u5e2b\u3001\u5f8c\u7aef\u958b\u767c\u4eba\u54e1\u9084\u662f\u6578\u64da\u5eab\u7ba1\u7406\u54e1\uff0c\u9762\u8a66\u4e2d\u90fd\u53ef\u80fd\u6703\u9047\u5230\u8207 SQL \u6578\u64da\u5eab\u76f8\u95dc\u7684\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u6578\u64da\u5eab\u9762\u8a66\u554f\u984c\u53ca\u5176\u89e3\u7b54\uff0c\u5e6b\u52a9\u6c42\u8077\u8005\u66f4\u597d\u5730\u6e96\u5099\u9762\u8a66\u3002<\/p>\n<h2 id=\"1-sql-%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%9f-mJquInyHDx\">1. SQL \u662f\u4ec0\u9ebc\uff1f<\/h2>\n<p>SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5982\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u6578\u64da\u3001\u63d2\u5165\u6578\u64da\u548c\u522a\u9664\u6578\u64da\u3002SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u7c21\u55ae\u6613\u61c2\uff0c\u4f7f\u5176\u6210\u70ba\u6578\u64da\u5eab\u7ba1\u7406\u7684\u4e3b\u8981\u5de5\u5177\u3002<\/p>\n<h2 id=\"2-%e4%bb%80%e9%ba%bc%e6%98%af%e9%97%9c%e4%bf%82%e5%9e%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-mJquInyHDx\">2. \u4ec0\u9ebc\u662f\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff1f<\/h2>\n<p>\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u662f\u4e00\u7a2e\u4ee5\u8868\u683c\u5f62\u5f0f\u5b58\u5132\u6578\u64da\u7684\u6578\u64da\u5eab\u3002\u6bcf\u500b\u8868\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u884c\u4ee3\u8868\u8a18\u9304\uff0c\u5217\u4ee3\u8868\u5c6c\u6027\u3002\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4f7f\u7528\u4e3b\u9375\u548c\u5916\u9375\u4f86\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u9019\u4f7f\u5f97\u6578\u64da\u7684\u7d44\u7e54\u548c\u6aa2\u7d22\u8b8a\u5f97\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2 id=\"3-%e5%b8%b8%e8%a6%8b%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f-mJquInyHDx\">3. \u5e38\u898b\u7684 SQL \u8a9e\u53e5\u6709\u54ea\u4e9b\uff1f<\/h2>\n<ul>\n<li><code>SELECT<\/code>\uff1a\u7528\u65bc\u67e5\u8a62\u6578\u64da\u3002<\/li>\n<li><code>INSERT<\/code>\uff1a\u7528\u65bc\u63d2\u5165\u65b0\u6578\u64da\u3002<\/li>\n<li><code>UPDATE<\/code>\uff1a\u7528\u65bc\u66f4\u65b0\u73fe\u6709\u6578\u64da\u3002<\/li>\n<li><code>DELETE<\/code>\uff1a\u7528\u65bc\u522a\u9664\u6578\u64da\u3002<\/li>\n<li><code>CREATE TABLE<\/code>\uff1a\u7528\u65bc\u5275\u5efa\u65b0\u8868\u3002<\/li>\n<li><code>ALTER TABLE<\/code>\uff1a\u7528\u65bc\u4fee\u6539\u73fe\u6709\u8868\u7684\u7d50\u69cb\u3002<\/li>\n<li><code>DROP TABLE<\/code>\uff1a\u7528\u65bc\u522a\u9664\u8868\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e4%bb%80%e9%ba%bc%e6%98%af%e4%b8%bb%e9%8d%b5%e5%92%8c%e5%a4%96%e9%8d%b5%ef%bc%9f-mJquInyHDx\">4. \u4ec0\u9ebc\u662f\u4e3b\u9375\u548c\u5916\u9375\uff1f<\/h2>\n<p>\u4e3b\u9375\u662f\u8868\u4e2d\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u7684\u5b57\u6bb5\uff0c\u78ba\u4fdd\u6bcf\u689d\u8a18\u9304\u90fd\u662f\u552f\u4e00\u7684\u3002\u5916\u9375\u5247\u662f\u6307\u5411\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\uff0c\u7528\u65bc\u5efa\u7acb\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u8a02\u55ae\u8868\u4e2d\uff0c\u5ba2\u6236ID\u53ef\u4ee5\u4f5c\u70ba\u5916\u9375\uff0c\u6307\u5411\u5ba2\u6236\u8868\u4e2d\u7684\u4e3b\u9375\u3002<\/p>\n<h2 id=\"5-%e4%bb%80%e9%ba%bc%e6%98%af-join-%e6%93%8d%e4%bd%9c%ef%bc%9f-mJquInyHDx\">5. \u4ec0\u9ebc\u662f JOIN \u64cd\u4f5c\uff1f<\/h2>\n<p>JOIN \u64cd\u4f5c\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u5e38\u898b\u7684 JOIN \u985e\u578b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>INNER JOIN<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>LEFT JOIN<\/strong>\uff1a\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u4ee5\u53ca\u53f3\u8868\u4e2d\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>RIGHT JOIN<\/strong>\uff1a\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u4ee5\u53ca\u5de6\u8868\u4e2d\u5339\u914d\u7684\u8a18\u9304\u3002<\/li>\n<li><strong>FULL OUTER JOIN<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u7121\u8ad6\u662f\u5426\u5339\u914d\u3002<\/li>\n<\/ul>\n<h2 id=\"6-%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-mJquInyHDx\">6. \u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u7684\u57f7\u884c\u901f\u5ea6\u3002\u7136\u800c\uff0c\u7d22\u5f15\u4e5f\u6703\u589e\u52a0\u6578\u64da\u5eab\u7684\u5b58\u5132\u9700\u6c42\uff0c\u4e26\u53ef\u80fd\u5f71\u97ff\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c\u7684\u6027\u80fd\u3002<\/p>\n<h2 id=\"7-%e5%a6%82%e4%bd%95%e5%84%aa%e5%8c%96-sql-%e6%9f%a5%e8%a9%a2%ef%bc%9f-mJquInyHDx\">7. \u5982\u4f55\u512a\u5316 SQL \u67e5\u8a62\uff1f<\/h2>\n<p>\u512a\u5316 SQL \u67e5\u8a62\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u512a\u5316\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u7d22\u5f15\u3002<\/li>\n<li>\u907f\u514d\u4f7f\u7528 SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\u3002<\/li>\n<li>\u4f7f\u7528 WHERE \u5b50\u53e5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<li>\u907f\u514d\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\uff0c\u6539\u7528 JOIN\u3002<\/li>\n<li>\u5b9a\u671f\u5206\u6790\u548c\u91cd\u5efa\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-mJquInyHDx\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u6578\u64da\u5eab\u9762\u8a66\u4e2d\uff0c\u4e86\u89e3\u57fa\u672c\u6982\u5ff5\u548c\u5e38\u898b\u554f\u984c\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u901a\u904e\u638c\u63e1 SQL \u8a9e\u6cd5\u3001\u6578\u64da\u5eab\u7d50\u69cb\u53ca\u5176\u64cd\u4f5c\uff0c\u6c42\u8077\u8005\u53ef\u4ee5\u5728\u9762\u8a66\u4e2d\u8868\u73fe\u51fa\u8272\u3002\u82e5\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u670d\u52d9\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u9019\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u60a8\u7684\u5de5\u4f5c\u6548\u7387\u548c\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u6578\u64da\u5eab\u9762\u8a66\u7684\u5e38\u898b\u554f\u984c\u8207\u89e3\u7b54\uff0c\u5e6b\u52a9\u4f60\u6e96\u5099\u9762\u8a66\uff0c\u63d0\u5347\u6280\u80fd\uff0c\u589e\u5f37\u81ea\u4fe1\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-144011","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=144011"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144011\/revisions"}],"predecessor-version":[{"id":144012,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144011\/revisions\/144012"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144011"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144011"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144011"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}