{"id":148549,"date":"2024-11-01T14:06:27","date_gmt":"2024-11-01T06:06:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/148549\/"},"modified":"2024-11-01T14:06:28","modified_gmt":"2024-11-01T06:06:28","slug":"%e9%98%bf%e9%87%8c%e4%ba%8c%e9%9d%a2%ef%bc%9a%e4%b8%80%e6%a2%9dsql%e8%aa%9e%e5%8f%a5%ef%bc%8c%e5%9c%a8mysql%e5%bc%95%e6%93%8e%e4%b8%ad%e5%88%b0%e5%ba%95%e7%b6%93%e6%ad%b7%e4%ba%86%e4%bb%80%e9%ba%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/148549\/","title":{"rendered":"\u963f\u91cc\u4e8c\u9762\uff1a\u4e00\u689dSQL\u8a9e\u53e5\uff0c\u5728MySQL\u5f15\u64ce\u4e2d\u5230\u5e95\u7d93\u6b77\u4e86\u4ec0\u9ebc\uff1f"},"content":{"rendered":"

\u963f\u91cc\u4e8c\u9762\uff1a\u4e00\u689dSQL\u8a9e\u53e5\uff0c\u5728MySQL\u5f15\u64ce\u4e2d\u5230\u5e95\u7d93\u6b77\u4e86\u4ec0\u9ebc\uff1f<\/h1>\n

\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u4ea4\u4e92\u7684\u4e3b\u8981\u65b9\u5f0f\u4e4b\u4e00\u3002\u7279\u5225\u662f\u5728MySQL\u9019\u6a23\u7684\u6d41\u884c\u6578\u64da\u5eab\u5f15\u64ce\u4e2d\uff0c\u7406\u89e3\u4e00\u689dSQL\u8a9e\u53e5\u7684\u57f7\u884c\u904e\u7a0b\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u4e00\u689dSQL\u8a9e\u53e5\u5728MySQL\u5f15\u64ce\u4e2d\u7d93\u6b77\u7684\u5404\u500b\u968e\u6bb5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u80cc\u5f8c\u7684\u904b\u4f5c\u539f\u7406\u3002<\/p>\n

1. SQL\u8a9e\u53e5\u7684\u89e3\u6790<\/h2>\n

\u7576\u4e00\u689dSQL\u8a9e\u53e5\u88ab\u63d0\u4ea4\u5230MySQL\u6642\uff0c\u9996\u5148\u6703\u9032\u884c\u89e3\u6790\u3002\u9019\u4e00\u904e\u7a0b\u5305\u62ec\u8a9e\u6cd5\u5206\u6790\u548c\u8a9e\u7fa9\u5206\u6790\u3002\u8a9e\u6cd5\u5206\u6790\u662f\u6aa2\u67e5SQL\u8a9e\u53e5\u7684\u7d50\u69cb\u662f\u5426\u6b63\u78ba\uff0c\u78ba\u4fdd\u6240\u6709\u7684\u95dc\u9375\u5b57\u3001\u6a19\u8b58\u7b26\u548c\u7b26\u865f\u90fd\u7b26\u5408SQL\u8a9e\u6cd5\u898f\u7bc4\u3002\u8a9e\u7fa9\u5206\u6790\u5247\u662f\u6aa2\u67e5\u8a9e\u53e5\u4e2d\u4f7f\u7528\u7684\u8868\u3001\u5217\u7b49\u662f\u5426\u5b58\u5728\u65bc\u6578\u64da\u5eab\u4e2d\u3002<\/p>\n

SELECT name FROM users WHERE age > 18;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cMySQL\u6703\u6aa2\u67e5\u201cusers\u201d\u8868\u548c\u201cname\u201d\u3001\u201cage\u201d\u5217\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u8a9e\u53e5\u6709\u8aa4\uff0cMySQL\u6703\u8fd4\u56de\u932f\u8aa4\u4fe1\u606f\uff0c\u544a\u8a34\u7528\u6236\u5177\u9ad4\u7684\u554f\u984c\u6240\u5728\u3002<\/p>\n
2. \u67e5\u8a62\u512a\u5316<\/h2>\n
\u4e00\u65e6SQL\u8a9e\u53e5\u88ab\u89e3\u6790\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u67e5\u8a62\u512a\u5316\u3002MySQL\u7684\u67e5\u8a62\u512a\u5316\u5668\u6703\u751f\u6210\u4e00\u500b\u57f7\u884c\u8a08\u5283\uff0c\u9019\u662f\u6c7a\u5b9a\u5982\u4f55\u9ad8\u6548\u57f7\u884c\u67e5\u8a62\u7684\u95dc\u9375\u6b65\u9a5f\u3002\u512a\u5316\u5668\u6703\u8003\u616e\u591a\u7a2e\u56e0\u7d20\uff0c\u5305\u62ec\u7d22\u5f15\u7684\u4f7f\u7528\u3001\u8868\u7684\u9023\u63a5\u9806\u5e8f\u4ee5\u53ca\u904e\u6ffe\u689d\u4ef6\u7684\u61c9\u7528\u7b49\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u201cusers\u201d\u8868\u4e0a\u6709\u4e00\u500b\u91dd\u5c0d\u201cage\u201d\u5217\u7684\u7d22\u5f15\uff0c\u512a\u5316\u5668\u53ef\u80fd\u6703\u9078\u64c7\u4f7f\u7528\u9019\u500b\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u9700\u8981\u6383\u63cf\u7684\u884c\u6578\uff0c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n
3. \u57f7\u884c\u8a08\u5283\u7684\u751f\u6210<\/h2>\n
\u5728\u67e5\u8a62\u512a\u5316\u4e4b\u5f8c\uff0cMySQL\u6703\u751f\u6210\u4e00\u500b\u5177\u9ad4\u7684\u57f7\u884c\u8a08\u5283\u3002\u9019\u500b\u8a08\u5283\u8a73\u7d30\u63cf\u8ff0\u4e86\u5982\u4f55\u57f7\u884c\u67e5\u8a62\uff0c\u5305\u62ec\u4f7f\u7528\u54ea\u4e9b\u7d22\u5f15\u3001\u5982\u4f55\u9032\u884c\u8868\u7684\u9023\u63a5\u7b49\u3002\u7528\u6236\u53ef\u4ee5\u901a\u904e\u57f7\u884cEXPLAIN\u8a9e\u53e5\u4f86\u67e5\u770b\u9019\u500b\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u4e86\u89e3MySQL\u662f\u5982\u4f55\u8655\u7406\u8a72\u67e5\u8a62\u7684\u3002<\/p>\n
EXPLAIN SELECT name FROM users WHERE age > 18;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u6703\u8fd4\u56de\u4e00\u500b\u8868\u683c\uff0c\u986f\u793a\u6bcf\u4e00\u6b65\u7684\u57f7\u884c\u65b9\u5f0f\u548c\u9810\u8a08\u7684\u6210\u672c\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u9032\u884c\u6027\u80fd\u8abf\u512a\u3002<\/p>\n
4. \u5be6\u969b\u57f7\u884c<\/h2>\n
\u7576\u57f7\u884c\u8a08\u5283\u78ba\u5b9a\u5f8c\uff0cMySQL\u5c07\u958b\u59cb\u5be6\u969b\u57f7\u884c\u67e5\u8a62\u3002\u9019\u4e00\u904e\u7a0b\u5305\u62ec\u5f9e\u78c1\u789f\u4e2d\u8b80\u53d6\u6578\u64da\u3001\u61c9\u7528\u904e\u6ffe\u689d\u4ef6\u3001\u9032\u884c\u6392\u5e8f\u548c\u5206\u7d44\u7b49\u64cd\u4f5c\u3002MySQL\u6703\u6839\u64da\u57f7\u884c\u8a08\u5283\u4e2d\u7684\u6307\u793a\uff0c\u9010\u6b65\u8655\u7406\u6578\u64da\uff0c\u6700\u7d42\u751f\u6210\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n
5. \u8fd4\u56de\u7d50\u679c<\/h2>\n
\u6700\u5f8c\uff0c\u67e5\u8a62\u7d50\u679c\u6703\u88ab\u8fd4\u56de\u7d66\u7528\u6236\u3002\u9019\u4e9b\u7d50\u679c\u53ef\u4ee5\u662f\u55ae\u884c\u3001\u591a\u884c\u6216\u662f\u7a7a\u7d50\u679c\u96c6\uff0c\u5177\u9ad4\u53d6\u6c7a\u65bc\u67e5\u8a62\u7684\u689d\u4ef6\u548c\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u72c0\u614b\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7406\u89e3\u4e00\u689dSQL\u8a9e\u53e5\u5728MySQL\u5f15\u64ce\u4e2d\u7684\u57f7\u884c\u904e\u7a0b\uff0c\u5c0d\u65bc\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u548c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u5f9e\u89e3\u6790\u3001\u512a\u5316\u5230\u57f7\u884c\uff0c\u6bcf\u4e00\u500b\u6b65\u9a5f\u90fd\u5f71\u97ff\u8457\u6700\u7d42\u7684\u67e5\u8a62\u7d50\u679c\u3002\u5c0d\u65bc\u5e0c\u671b\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6280\u80fd\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u6df1\u5165\u4e86\u89e3\u9019\u4e9b\u904e\u7a0b\u5c07\u6709\u52a9\u65bc\u4ed6\u5011\u66f4\u6709\u6548\u5730\u4f7f\u7528MySQL\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u963f\u91cc\u4e8c\u9762\u4e2d\u4e00\u689dSQL\u8a9e\u53e5\u5728MySQL\u5f15\u64ce\u4e2d\u7684\u8655\u7406\u904e\u7a0b\uff0c\u63ed\u793a\u5176\u80cc\u5f8c\u7684\u904b\u4f5c\u6a5f\u5236\u8207\u6027\u80fd\u512a\u5316\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-148549","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/148549","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=148549"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/148549\/revisions"}],"predecessor-version":[{"id":148550,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/148549\/revisions\/148550"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=148549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=148549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=148549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}