{"id":5208,"date":"2024-11-14T09:43:18","date_gmt":"2024-11-14T01:43:18","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5208\/"},"modified":"2024-11-14T09:43:18","modified_gmt":"2024-11-14T01:43:18","slug":"sql%e7%b4%a2%e5%bc%95%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5208\/","title":{"rendered":"sql\u7d22\u5f15\u600e\u4e48\u7528"},"content":{"rendered":"<blockquote><p>\n  sql \u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u52a0\u5feb\u6570\u636e\u5e93\u68c0\u7d22\u3002\u5b83\u901a\u8fc7\u5b58\u50a8\u6570\u636e\u526f\u672c\u548c\u6307\u5411\u5b9e\u9645\u6570\u636e\u884c\u7684\u6307\u9488\u6765\u5b9e\u73b0\u3002\u7d22\u5f15\u7c7b\u578b\u5305\u62ec b \u6811\u3001\u54c8\u5e0c\u548c\u4f4d\u56fe\u7d22\u5f15\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u5e26\u6765\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\u3001\u66f4\u4f4e\u7684 cpu \u548c\u5185\u5b58\u4f7f\u7528\u7387\u4ee5\u53ca\u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\u3002\u7d22\u5f15\u5e94\u521b\u5efa\u5728\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u7684\u5217\u4e0a\uff0c\u907f\u514d\u521b\u5efa\u5728\u5927\u5e45\u5ea6\u66f4\u65b0\u7684\u5217\u4e0a\uff0c\u5e76\u5b9a\u671f\u7ef4\u62a4\u4ee5\u786e\u4fdd\u5176\u6700\u65b0\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/24\/2024052420482347420.jpg\" class=\"aligncenter\" title=\"sql\u7d22\u5f15\u600e\u4e48\u7528\u63d2\u56fe\" alt=\"sql\u7d22\u5f15\u600e\u4e48\u7528\u63d2\u56fe\" \/><\/p>\n<p><strong>SQL \u7d22\u5f15\uff1a\u7528\u9014\u4e0e\u5e94\u7528<\/strong><\/p>\n<p><strong>\u4ec0\u4e48\u662f SQL \u7d22\u5f15\uff1f<\/strong><\/p>\n<p>SQL \u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u52a0\u5feb\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u68c0\u7d22\u901f\u5ea6\u3002\u7d22\u5f15\u4e0e\u4f20\u7edf\u4e66\u7c4d\u7684\u76ee\u5f55\u7c7b\u4f3c\uff0c\u5b83\u63d0\u4f9b\u4e86\u5feb\u901f\u67e5\u627e\u7279\u5b9a\u6570\u636e\u7684\u6377\u5f84\uff0c\u800c\u65e0\u9700\u626b\u63cf\u6574\u4e2a\u8868\u3002<\/p>\n<p><strong>\u7d22\u5f15\u5982\u4f55\u8fd0\u4f5c\uff1f<\/strong><\/p>\n<p>\u7d22\u5f15\u662f\u6784\u5efa\u5728\u8868\u4e2d\u7684\u6570\u636e\u5217\u4e4b\u4e0a\u3002\u5b83\u5b58\u50a8\u4e86\u6570\u636e\u7684\u526f\u672c\u548c\u6307\u5411\u5b9e\u9645\u6570\u636e\u884c\u7684\u6307\u9488\u3002\u5f53\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u6570\u636e\u5e93\u5f15\u64ce\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u5feb\u901f\u67e5\u627e\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u6570\u636e\uff0c\u800c\u65e0\u9700\u9010\u884c\u904d\u5386\u8868\u3002<\/p>\n<p><strong>\u7d22\u5f15\u7684\u7c7b\u578b<\/strong><\/p>\n<p>SQL \u4e2d\u6709\u4e0d\u540c\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u6bcf\u79cd\u7c7b\u578b\u90fd\u9002\u5408\u4e0d\u540c\u7684\u76ee\u7684\uff1a<\/p>\n<ul>\n<li> <strong>B \u6811\u7d22\u5f15\uff1a<\/strong>\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u5c06\u6570\u636e\u7ec4\u7ec7\u6210\u5c42\u7ea7\u6811\u7ed3\u6784\uff0c\u4ee5\u4fbf\u5feb\u901f\u67e5\u627e\u3002<\/li>\n<li> <strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u76f8\u7b49\u6761\u4ef6\uff0c\u5b83\u5c06\u6570\u636e\u5b58\u50a8\u5728\u54c8\u5e0c\u8868\u4e2d\uff0c\u5e76\u4f7f\u7528\u54c8\u5e0c\u51fd\u6570\u76f4\u63a5\u67e5\u627e\u7279\u5b9a\u503c\u3002<\/li>\n<li> <strong>\u4f4d\u56fe\u7d22\u5f15\uff1a<\/strong>\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u7279\u5b9a\u6807\u5fd7\u6216\u6761\u4ef6\u7684\u503c\uff0c\u5b83\u5c06\u6bcf\u4e2a\u6761\u4ef6\u503c\u6620\u5c04\u5230\u4e00\u4e2a\u4f4d\uff0c\u5e76\u521b\u5efa\u4f4d\u56fe\u6765\u5b58\u50a8\u8fd9\u4e9b\u503c\u3002<\/li>\n<\/ul>\n<p><strong>\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u7d22\u5f15\uff1f<\/strong><\/p>\n<p>\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u597d\u5904\uff1a<\/p>\n<ul>\n<li> <strong>\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u52a0\u5feb\u67e5\u8be2\u901f\u5ea6\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\u3002<\/li>\n<li> <strong>\u66f4\u4f4e\u7684 CPU \u548c\u5185\u5b58\u4f7f\u7528\u7387\uff1a<\/strong>\u7d22\u5f15\u51cf\u5c11\u4e86\u626b\u63cf\u8868\u7684\u9700\u8981\uff0c\u4ece\u800c\u8282\u7701\u4e86 CPU \u548c\u5185\u5b58\u8d44\u6e90\u3002<\/li>\n<li> <strong>\u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\uff1a<\/strong>\u6570\u636e\u5e93\u5f15\u64ce\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u521b\u5efa\u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\uff0c\u4ece\u800c\u8fdb\u4e00\u6b65\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p><strong>\u5982\u4f55\u521b\u5efa\u7d22\u5f15\uff1f<\/strong><\/p>\n<p>\u5728 SQL \u4e2d\u521b\u5efa\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n<pre>CREATE INDEX [\u7d22\u5f15\u540d\u79f0] ON [\u8868\u540d\u79f0] ([\u7d22\u5f15\u5217]);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>CREATE INDEX idx_employee_name ON employees (name);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<p>\u4f7f\u7528\u7d22\u5f15\u65f6\uff0c\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5b9e\u8df5\uff1a<\/p>\n<ul>\n<li>\u7d22\u5f15\u53ea\u5e94\u521b\u5efa\u5728\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u7684\u5217\u4e0a\u3002<\/li>\n<li>\u7d22\u5f15\u4e0d\u5e94\u521b\u5efa\u5728\u5927\u5e45\u5ea6\u66f4\u65b0\u7684\u5217\u4e0a\u3002<\/li>\n<li>\u5e94\u5b9a\u671f\u7ef4\u62a4\u7d22\u5f15\u4ee5\u786e\u4fdd\u5176 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\u7d22\u5f15\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>sql \u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u52a0\u5feb\u6570\u636e\u5e93\u68c0\u7d22\u3002\u5b83\u901a\u8fc7\u5b58\u50a8\u6570\u636e\u526f\u672c\u548c\u6307\u5411\u5b9e\u9645\u6570\u636e\u884c\u7684\u6307\u9488\u6765\u5b9e\u73b0\u3002\u7d22\u5f15\u7c7b\u578b\u5305\u62ec b \u6811\u3001\u54c8\u5e0c\u548c\u4f4d\u56fe\u7d22\u5f15\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u5e26\u6765\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\u3001\u66f4\u4f4e\u7684 cpu \u548c\u5185\u5b58\u4f7f\u7528\u7387\u4ee5\u53ca\u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\u3002\u7d22\u5f15\u5e94\u521b\u5efa\u5728\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u7684\u5217\u4e0a\uff0c\u907f\u514d\u521b\u5efa\u5728\u5927\u5e45\u5ea6\u66f4\u65b0\u7684\u5217\u4e0a\uff0c\u5e76\u5b9a\u671f\u7ef4\u62a4\u4ee5\u786e\u4fdd\u5176\u6700\u65b0\u3002 SQL \u7d22\u5f15\uff1a\u7528\u9014\u4e0e\u5e94\u7528 \u4ec0\u4e48\u662f SQL \u7d22\u5f15\uff1f SQL \u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u52a0\u5feb\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u68c0\u7d22\u901f\u5ea6\u3002\u7d22\u5f15\u4e0e\u4f20\u7edf\u4e66\u7c4d\u7684\u76ee\u5f55\u7c7b\u4f3c\uff0c\u5b83\u63d0\u4f9b\u4e86\u5feb\u901f\u67e5\u627e\u7279\u5b9a\u6570\u636e\u7684\u6377\u5f84\uff0c\u800c\u65e0\u9700\u626b\u63cf\u6574\u4e2a\u8868\u3002 \u7d22\u5f15\u5982\u4f55\u8fd0\u4f5c\uff1f \u7d22\u5f15\u662f\u6784\u5efa\u5728\u8868\u4e2d\u7684\u6570\u636e\u5217\u4e4b\u4e0a\u3002\u5b83\u5b58\u50a8\u4e86\u6570\u636e\u7684\u526f\u672c\u548c\u6307\u5411\u5b9e\u9645\u6570\u636e\u884c\u7684\u6307\u9488\u3002\u5f53\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u6570\u636e\u5e93\u5f15\u64ce\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u5feb\u901f\u67e5\u627e\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u6570\u636e\uff0c\u800c\u65e0\u9700\u9010\u884c\u904d\u5386\u8868\u3002 \u7d22\u5f15\u7684\u7c7b\u578b SQL \u4e2d\u6709\u4e0d\u540c\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u6bcf\u79cd\u7c7b\u578b\u90fd\u9002\u5408\u4e0d\u540c\u7684\u76ee\u7684\uff1a B \u6811\u7d22\u5f15\uff1a\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u5c06\u6570\u636e\u7ec4\u7ec7\u6210\u5c42\u7ea7\u6811\u7ed3\u6784\uff0c\u4ee5\u4fbf\u5feb\u901f\u67e5\u627e\u3002 \u54c8\u5e0c\u7d22\u5f15\uff1a\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u76f8\u7b49\u6761\u4ef6\uff0c\u5b83\u5c06\u6570\u636e\u5b58\u50a8\u5728\u54c8\u5e0c\u8868\u4e2d\uff0c\u5e76\u4f7f\u7528\u54c8\u5e0c\u51fd\u6570\u76f4\u63a5\u67e5\u627e\u7279\u5b9a\u503c\u3002 \u4f4d\u56fe\u7d22\u5f15\uff1a\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u7279\u5b9a\u6807\u5fd7\u6216\u6761\u4ef6\u7684\u503c\uff0c\u5b83\u5c06\u6bcf\u4e2a\u6761\u4ef6\u503c\u6620\u5c04\u5230\u4e00\u4e2a\u4f4d\uff0c\u5e76\u521b\u5efa\u4f4d\u56fe\u6765\u5b58\u50a8\u8fd9\u4e9b\u503c\u3002 \u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u7d22\u5f15\uff1f \u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u597d\u5904\uff1a \u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\uff1a\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u52a0\u5feb\u67e5\u8be2\u901f\u5ea6\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\u3002 \u66f4\u4f4e\u7684 CPU \u548c\u5185\u5b58\u4f7f\u7528\u7387\uff1a\u7d22\u5f15\u51cf\u5c11\u4e86\u626b\u63cf\u8868\u7684\u9700\u8981\uff0c\u4ece\u800c\u8282\u7701\u4e86 CPU \u548c\u5185\u5b58\u8d44\u6e90\u3002 \u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\uff1a\u6570\u636e\u5e93\u5f15\u64ce\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u521b\u5efa\u66f4\u4f18\u5316\u7684\u67e5\u8be2\u8ba1\u5212\uff0c\u4ece\u800c\u8fdb\u4e00\u6b65\u63d0\u9ad8\u6027\u80fd\u3002 \u5982\u4f55\u521b\u5efa\u7d22\u5f15\uff1f \u5728 SQL \u4e2d\u521b\u5efa\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a CREATE INDEX [\u7d22\u5f15\u540d\u79f0] ON [\u8868\u540d\u79f0] ([\u7d22\u5f15\u5217]); \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff1a CREATE INDEX idx_employee_name ON employees (name); \u767b\u5f55\u540e\u590d\u5236 \u6700\u4f73\u5b9e\u8df5 \u4f7f\u7528\u7d22\u5f15\u65f6\uff0c\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5b9e\u8df5\uff1a \u7d22\u5f15\u53ea\u5e94\u521b\u5efa\u5728\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u7684\u5217\u4e0a\u3002 \u7d22\u5f15\u4e0d\u5e94\u521b\u5efa\u5728\u5927\u5e45\u5ea6\u66f4\u65b0\u7684\u5217\u4e0a\u3002 \u5e94\u5b9a\u671f\u7ef4\u62a4\u7d22\u5f15\u4ee5\u786e\u4fdd\u5176 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5208","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5208"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5208\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}