{"id":192332,"date":"2024-11-12T18:52:22","date_gmt":"2024-11-12T10:52:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/192332\/"},"modified":"2024-11-12T18:52:23","modified_gmt":"2024-11-12T10:52:23","slug":"%e5%af%ab%e5%87%ba%e9%ab%98%e6%80%a7%e8%83%bdsql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%8d%81%e4%b8%89%e6%a2%9d%e6%b3%95%e5%89%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/192332\/","title":{"rendered":"\u5beb\u51fa\u9ad8\u6027\u80fdSQL\u8a9e\u53e5\u7684\u5341\u4e09\u689d\u6cd5\u5247"},"content":{"rendered":"<h1 id=\"%e5%af%ab%e5%87%ba%e9%ab%98%e6%80%a7%e8%83%bdsql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%8d%81%e4%b8%89%e6%a2%9d%e6%b3%95%e5%89%87-cWIOUpQNmU\">\u5beb\u51fa\u9ad8\u6027\u80fdSQL\u8a9e\u53e5\u7684\u5341\u4e09\u689d\u6cd5\u5247<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u7684\u4e3b\u8981\u5de5\u5177\u3002\u9ad8\u6548\u7684SQL\u8a9e\u53e5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u80fd\u6e1b\u5c11\u4f3a\u670d\u5668\u7684\u8ca0\u64d4\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5341\u4e09\u689d\u6cd5\u5247\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u64b0\u5beb\u9ad8\u6027\u80fd\u7684SQL\u8a9e\u53e5\u3002<\/p>\n<h2 id=\"1-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-cWIOUpQNmU\">1. \u9069\u7576\u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u67e5\u8a62\u4e2d\u7d93\u5e38\u4f7f\u7528\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u9078\u64c7\u3002<\/p>\n<h2 id=\"2-%e9%81%bf%e5%85%8dselect-cWIOUpQNmU\">2. \u907f\u514dSELECT *<\/h2>\n<p>\u4f7f\u7528 <code>SELECT *<\/code> \u6703\u8fd4\u56de\u6240\u6709\u5217\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u91cf\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8join%e8%80%8c%e9%9d%9e%e5%ad%90%e6%9f%a5%e8%a9%a2-cWIOUpQNmU\">3. \u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62<\/h2>\n<p>\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>JOIN<\/code> \u4f86\u9023\u63a5\u8868\u6bd4\u4f7f\u7528\u5b50\u67e5\u8a62\u66f4\u9ad8\u6548\u3002\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u591a\u6b21\u67e5\u8a62\uff0c\u800c <code>JOIN<\/code> \u53ef\u4ee5\u5728\u4e00\u6b21\u67e5\u8a62\u4e2d\u5b8c\u6210\u3002<\/p>\n<h2 id=\"4-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5-cWIOUpQNmU\">4. \u9069\u7576\u4f7f\u7528WHERE\u5b50\u53e5<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u78ba\u4fdd\u5728 <code>WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528\u7d22\u5f15\u5217\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<h2 id=\"5-%e9%81%bf%e5%85%8d%e5%9c%a8where%e5%ad%90%e5%8f%a5%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%87%bd%e6%95%b8-cWIOUpQNmU\">5. \u907f\u514d\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578<\/h2>\n<p>\u5728 <code>WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578\u6703\u5c0e\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002\u61c9\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6578\uff0c\u4e26\u8003\u616e\u5c07\u51fd\u6578\u79fb\u81f3\u67e5\u8a62\u7684\u5176\u4ed6\u90e8\u5206\u3002<\/p>\n<h2 id=\"6-%e4%bd%bf%e7%94%a8limit%e9%99%90%e5%88%b6%e7%b5%90%e6%9e%9c%e9%9b%86-cWIOUpQNmU\">6. \u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6<\/h2>\n<p>\u7576\u53ea\u9700\u8981\u90e8\u5206\u7d50\u679c\u6642\uff0c\u4f7f\u7528 <code>LIMIT<\/code> \u53ef\u4ee5\u6e1b\u5c11\u8fd4\u56de\u7684\u6578\u64da\u91cf\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c<code>SELECT * FROM table LIMIT 10;<\/code> \u53ea\u8fd4\u56de\u524d\u5341\u689d\u8a18\u9304\u3002<\/p>\n<h2 id=\"7-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8group-by%e5%92%8chaving-cWIOUpQNmU\">7. \u9069\u7576\u4f7f\u7528GROUP BY\u548cHAVING<\/h2>\n<p>\u5728\u4f7f\u7528 <code>GROUP BY<\/code> \u6642\uff0c\u61c9\u78ba\u4fdd\u53ea\u5c0d\u5fc5\u8981\u7684\u5217\u9032\u884c\u5206\u7d44\u3002\u4f7f\u7528 <code>HAVING<\/code> \u9032\u884c\u904e\u6ffe\u6642\uff0c\u61c9\u8a72\u5728 <code>GROUP BY<\/code> \u4e4b\u5f8c\u9032\u884c\uff0c\u4e26\u76e1\u91cf\u907f\u514d\u4f7f\u7528\u3002<\/p>\n<h2 id=\"8-%e4%bd%bf%e7%94%a8%e4%ba%8b%e5%8b%99%e4%be%86%e6%8f%90%e9%ab%98%e6%80%a7%e8%83%bd-cWIOUpQNmU\">8. \u4f7f\u7528\u4e8b\u52d9\u4f86\u63d0\u9ad8\u6027\u80fd<\/h2>\n<p>\u5728\u9032\u884c\u591a\u500b\u5beb\u5165\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u6e1b\u5c11\u4f3a\u670d\u5668\u7684\u8ca0\u64d4\u3002\u5c07\u591a\u500b\u64cd\u4f5c\u5305\u88dd\u5728\u4e00\u500b\u4e8b\u52d9\u4e2d\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"9-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-cWIOUpQNmU\">9. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u91cd\u5efa\u7d22\u5f15\u548c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u53ef\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u6709\u52a9\u65bc\u78ba\u4fdd\u67e5\u8a62\u8a08\u5283\u7684\u6700\u4f73\u5316\u3002<\/p>\n<h2 id=\"10-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-cWIOUpQNmU\">10. \u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u4e26\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u4f7f\u7528 <code>INT<\/code> \u800c\u4e0d\u662f <code>BIGINT<\/code>\u3002<\/p>\n<h2 id=\"11-%e9%81%bf%e5%85%8d%e9%8e%96%e5%ae%9a-cWIOUpQNmU\">11. \u907f\u514d\u9396\u5b9a<\/h2>\n<p>\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u9396\u5b9a\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002\u61c9\u8a72\u76e1\u91cf\u6e1b\u5c11\u9396\u5b9a\u7684\u7bc4\u570d\u548c\u6642\u9593\uff0c\u4e26\u8003\u616e\u4f7f\u7528\u975e\u9396\u5b9a\u7684\u67e5\u8a62\u3002<\/p>\n<h2 id=\"12-%e4%bd%bf%e7%94%a8%e6%9f%a5%e8%a9%a2%e7%b7%a9%e5%ad%98-cWIOUpQNmU\">12. \u4f7f\u7528\u67e5\u8a62\u7de9\u5b58<\/h2>\n<p>\u8a31\u591a\u6578\u64da\u5eab\u7cfb\u7d71\u652f\u6301\u67e5\u8a62\u7de9\u5b58\u3002\u901a\u904e\u555f\u7528\u67e5\u8a62\u7de9\u5b58\uff0c\u53ef\u4ee5\u63d0\u9ad8\u91cd\u8907\u67e5\u8a62\u7684\u6027\u80fd\uff0c\u56e0\u70ba\u7cfb\u7d71\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u7de9\u5b58\u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"13-%e6%b8%ac%e8%a9%a6%e5%92%8c%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2-cWIOUpQNmU\">13. \u6e2c\u8a66\u548c\u512a\u5316\u67e5\u8a62<\/h2>\n<p>\u6700\u5f8c\uff0c\u5b9a\u671f\u6e2c\u8a66\u548c\u512a\u5316\u67e5\u8a62\u662f\u4fdd\u6301\u9ad8\u6027\u80fd\u7684\u95dc\u9375\u3002\u4f7f\u7528\u6578\u64da\u5eab\u7684\u5206\u6790\u5de5\u5177\u4f86\u6aa2\u67e5\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u4e26\u6839\u64da\u7d50\u679c\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cWIOUpQNmU\">\u7e3d\u7d50<\/h2>\n<p>\u64b0\u5beb\u9ad8\u6027\u80fd\u7684SQL\u8a9e\u53e5\u9700\u8981\u9075\u5faa\u4e00\u4e9b\u57fa\u672c\u6cd5\u5247\uff0c\u5305\u62ec\u9069\u7576\u4f7f\u7528\u7d22\u5f15\u3001\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3001\u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\u7b49\u3002\u901a\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u4f3a\u670d\u5668\u8ca0\u64d4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u904b\u884c\u5728\u6700\u4f73\u74b0\u5883\u4e2d\uff0c\u5f9e\u800c\u9054\u5230\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u5beb\u51fa\u9ad8\u6027\u80fdSQL\u8a9e\u53e5\u7684\u5341\u4e09\u689d\u6cd5\u5247\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u8b93\u4f60\u7684\u6578\u64da\u8655\u7406\u66f4\u5feb\u901f\u6d41\u66a2\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-192332","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/192332","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=192332"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/192332\/revisions"}],"predecessor-version":[{"id":192333,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/192332\/revisions\/192333"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=192332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=192332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=192332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}