{"id":200147,"date":"2025-05-06T11:56:22","date_gmt":"2025-05-06T03:56:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200147\/"},"modified":"2025-05-06T11:56:22","modified_gmt":"2025-05-06T03:56:22","slug":"mysql-%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200147\/","title":{"rendered":"MySQL \u4f18\u5316\u6280\u5de7"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL \u4f18\u5316\u6280\u5de7<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300aMySQL \u4f18\u5316\u6280\u5de7\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241023\/17296693746718a8fe0cd5d.jpg\" class=\"aligncenter\"><\/p>\n<h2> \u4f18\u5316\u6570\u636e\u5e93\u7ed3\u6784 <\/h2>\n<h3> \u4f18\u5316\u6570\u636e\u5927\u5c0f <\/h3>\n<p>\u2192 \u51cf\u5c11\u78c1\u76d8\u5199\u5165\u548c\u8bfb\u53d6\u7684\u6570\u636e\u91cf<\/p>\n<p>\u2192 \u5728\u67e5\u8be2\u6267\u884c\u671f\u95f4\u4e3b\u52a8\u5904\u7406\u5176\u5185\u5bb9\u65f6\u4e3b\u5185\u5b58\u8f83\u5c11<\/p>\n<p>\u2192 \u4ea7\u751f\u66f4\u5c0f\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u66f4\u5feb\u5730\u5904\u7406<\/p>\n<p><strong>\u8868\u683c\u5217<\/strong><\/p>\n<ul>\n<li>\u5c3d\u53ef\u80fd\u4f7f\u7528\u6700\u9ad8\u6548\uff08\u6700\u5c0f\uff09\u7684\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u5982\u679c\u53ef\u80fd\uff0c\u5c06\u5217\u58f0\u660e\u4e3a NOT NULL \u2192 \u66f4\u597d\u5730\u4f7f\u7528\u7d22\u5f15\u5e76\u6d88\u9664\u6d4b\u8bd5\u6bcf\u4e2a\u503c\u662f\u5426\u4e3a NULL \u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n<p><strong>\u7d22\u5f15<\/strong><\/p>\n<ul>\n<li>\u8868\u7684\u4e3b\u7d22\u5f15\u5e94\u8be5\u5c3d\u53ef\u80fd\u77ed<\/li>\n<li>\u4ec5\u521b\u5efa\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u6240\u9700\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u6709\u5229\u4e8e\u68c0\u7d22\uff0c\u4f46\u4f1a\u51cf\u6162\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c\u3002<\/li>\n<li>\u641c\u7d22\u5217\u7684\u7ec4\u5408\u2192\u521b\u5efa\u590d\u5408\u7d22\u5f15<\/li>\n<li>\u7d22\u5f15\u4e2d\u7684\u7b2c\u4e00\u5217\u5e94\u8be5\u662f\u91cd\u590d\u6700\u591a\u7684\u5217 \u2192 \u4ee5\u83b7\u5f97\u66f4\u597d\u7684\u7d22\u5f15\u538b\u7f29\u3002<\/li>\n<\/ul>\n<p><strong>\u52a0\u5165<\/strong><\/p>\n<ul>\n<li>\u5728\u5177\u6709\u76f8\u540c\u6570\u636e\u7c7b\u578b\u7684\u4e0d\u540c\u8868\u4e2d\u58f0\u660e\u5177\u6709<strong>\u76f8\u540c<\/strong>\u4fe1\u606f\u7684\u5217 \u2192 \u76f8\u540c\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u4fdd\u6301\u5217\u540d\u7b80\u5355\uff0c<\/li>\n<\/ul>\n<p><strong>\u6807\u51c6\u5316<\/strong><\/p>\n<ul>\n<li>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u4fdd\u6301\u6240\u6709\u6570\u636e\u4e0d\u5197\u4f59<\/li>\n<li>\u5982\u679c\u901f\u5ea6\u6bd4\u78c1\u76d8\u7a7a\u95f4\u548c\u4fdd\u7559\u591a\u4e2a\u6570\u636e\u526f\u672c\u7684\u7ef4\u62a4\u6210\u672c\u66f4\u91cd\u8981<\/li>\n<\/ul>\n<h3> \u4f18\u5316\u6570\u636e\u7c7b\u578b <\/h3>\n<ul>\n<li>\u5bf9\u4e8e\u53ef\u4ee5\u8868\u793a\u4e3a\u5b57\u7b26\u4e32\u6216\u6570\u5b57\u7684\u552f\u4e00 ID \u6216\u5176\u4ed6\u503c\uff0c\u2192 \u6570\u5b57\u503c\u53ef\u4ee5\u7528\u6bd4\u76f8\u5e94\u5b57\u7b26\u4e32\u66f4\u5c11\u7684\u5b57\u8282\u5b58\u50a8\uff0c\u4f20\u8f93\u548c\u6bd4\u8f83\u5b83\u4eec\u901f\u5ea6\u66f4\u5feb\uff0c\u5360\u7528\u7684\u5185\u5b58\u66f4\u5c11\u3002<\/li>\n<li>\u6bd4\u8f83\u4e0d\u540c\u5217\u4e2d\u7684\u503c\u65f6\uff0c\u5c3d\u53ef\u80fd\u58f0\u660e\u5177\u6709\u76f8\u540c\u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u89c4\u5219\u7684\u5217 \u2192 \u907f\u514d\u5b57\u7b26\u4e32\u8f6c\u6362<\/li>\n<li>\u5bf9\u4e8e\u5927\u5c0f\u5c0f\u4e8e 8KB \u7684\u5217\u503c\uff0c\u8bf7\u4f7f\u7528\u4e8c\u8fdb\u5236 VARCHAR \u800c\u4e0d\u662f BLOB\u3002 GROUP BY \u548c ORDER BY \u5b50\u53e5\u53ef\u4ee5\u751f\u6210\u4e34\u65f6\u8868\uff0c\u5982\u679c\u539f\u59cb\u8868\u4e0d\u5305\u542b\u4efb\u4f55 BLOB \u5217\uff0c\u8fd9\u4e9b\u4e34\u65f6\u8868\u53ef\u4ee5\u4f7f\u7528 MEMORY \u5b58\u50a8\u5f15\u64ce\u3002<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u8868\u5305\u542b\u5b57\u7b26\u4e32\u5217\u5e76\u4e14\u4e0d\u7ecf\u5e38\u8bbf\u95ee\u2192\u62c6\u5206\u5230\u53e6\u4e00\u4e2a\u8868\u5e76\u8fde\u63a5\u2192\u5f53MySQL\u4ece\u4e00\u884c\u4e2d\u68c0\u7d22\u4efb\u4f55\u503c\u65f6\uff0c\u5b83\u4f1a\u8bfb\u53d6\u5305\u542b\u8be5\u884c\u6240\u6709\u5217\uff08\u53ef\u80fd\u8fd8\u6709\u5176\u4ed6\u76f8\u90bb\u884c\uff09\u7684\u6570\u636e\u5757\u3002\u4fdd\u6301\u6bcf\u884c\u8f83\u5c0f\uff0c\u4ec5\u5305\u542b\u6700\u5e38\u7528\u7684\u5217\uff0c\u53ef\u4ee5\u8ba9\u6bcf\u4e2a\u6570\u636e\u5757\u5bb9\u7eb3\u66f4\u591a\u884c\u3002<\/li>\n<li>\u5f53\u60a8\u4f7f\u7528\u968f\u673a\u751f\u6210\u7684\u503c\u4f5c\u4e3a InnoDB \u8868\u4e2d\u7684\u4e3b\u952e\u65f6\uff0c\u8bf7\u5728\u5176\u524d\u9762\u6dfb\u52a0\u4e00\u4e2a\u5347\u5e8f\u503c\uff0c\u4f8b\u5982\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\uff08\u5982\u679c\u53ef\u80fd\uff09\u3002<\/li>\n<li>\u5bf9\u4e8e\u5177\u6709\u591a\u4e2a\u5217\u7684\u8868\uff0c\u4e3a\u4e86\u51cf\u5c11\u4e0d\u4f7f\u7528 BLOB \u5217\u7684\u67e5\u8be2\u7684\u5185\u5b58\u9700\u6c42\uff0c\u8bf7\u8003\u8651\u5c06 BLOB \u5217\u62c6\u5206\u4e3a\u5355\u72ec\u7684\u8868\uff0c\u5e76\u5728\u9700\u8981\u65f6\u4f7f\u7528\u8054\u63a5\u67e5\u8be2\u5f15\u7528\u5b83<\/li>\n<li>\u2022 \u7531\u4e8e\u68c0\u7d22\u548c\u663e\u793a BLOB \u503c\u7684\u6027\u80fd\u8981\u6c42\u53ef\u80fd\u4e0e\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u6709\u5f88\u5927\u4e0d\u540c\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u5c06<strong>BLOB \u7279\u5b9a\u8868<\/strong> \u653e\u5728\u4e0d\u540c\u7684\u5b58\u50a8\u8bbe\u5907\u4e0a\uff0c\u751a\u81f3\u662f<strong>\u5355\u72ec\u7684\u5b58\u50a8\u8bbe\u5907\u4e0a\u3002\u6570\u636e\u5e93\u5b9e\u4f8b<\/strong>\u3002\u4f8b\u5982\uff0c\u8981\u68c0\u7d22 BLOB \u53ef\u80fd\u9700\u8981\u5927\u91cf\u987a\u5e8f\u78c1\u76d8\u8bfb\u53d6\uff0c\u8fd9\u6bd4 SSD \u8bbe\u5907\u66f4\u9002\u5408\u4f20\u7edf\u786c\u76d8\u9a71\u52a8\u5668\u3002<\/li>\n<li>\u60a8\u53ef\u4ee5\u5c06\u5217\u503c\u7684\u54c8\u5e0c\u5b58\u50a8\u5728\u5355\u72ec\u7684\u5217\u4e2d\uff0c\u5bf9\u8be5\u5217\u5efa\u7acb\u7d22\u5f15\uff0c\u7136\u540e\u5728\u67e5\u8be2\u4e2d\u6d4b\u8bd5\u54c8\u5e0c\u503c\uff0c\u800c\u4e0d\u662f\u6d4b\u8bd5\u975e\u5e38\u957f\u7684\u6587\u672c\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002 \uff08\u4f7f\u7528 MD5() \u6216 CRC32() \u51fd\u6570\u751f\u6210\u54c8\u5e0c\u503c\u3002\uff09<\/li>\n<\/ul>\n<h2> <strong>\u4f18\u5316 SQL \u8bed\u53e5<\/strong> <\/h2>\n<p>\u6211\u4eec\u53d1\u73b0\u5206\u4e24\u6b65\u5206\u6790\u6027\u80fd\u4e0d\u4f73\u7684\u67e5\u8be2\u5f88\u6709\u7528\uff1a<\/p>\n<ul>\n<li>\u4e86\u89e3\u60a8\u7684<em>\u5e94\u7528\u7a0b\u5e8f<\/em>\u68c0\u7d22\u7684\u6570\u636e\u662f\u5426\u8d85\u51fa\u60a8\u7684\u9700\u8981\u3002\u8fd9\u901a\u5e38\u610f\u5473\u7740\u5b83\u8bbf\u95ee\u4e86\u592a\u591a\u884c\uff0c\u4f46\u4e5f\u53ef\u80fd\u8bbf\u95ee\u4e86\u592a\u591a\u5217\u3002<\/li>\n<li>\u67e5\u660e<em>MySQL \u670d\u52a1\u5668<\/em>\u5206\u6790\u7684\u884c\u6570\u662f\u5426\u8d85\u51fa\u5176\u9700\u8981\u3002<\/li>\n<\/ul>\n<h3> <strong>\u4f18\u5316 SELECT \u8bed\u53e5<\/strong> <\/h3>\n<ul>\n<li>\u907f\u514d\u5728\u8c13\u8bcd\u4e2d\u4f7f\u7528\u51fd\u6570<\/li>\n<li>\u907f\u514d\u5728\u8c13\u8bcd\u5f00\u5934\u4f7f\u7528\u901a\u914d\u7b26 (%)<\/li>\n<li>\u4ec5\u5728\u5fc5\u8981\u65f6\u4f7f\u7528 DISTINCT \u548c UNION<\/li>\n<\/ul>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n<p> \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664 <\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u4f18\u5316\u6280\u5de7 \u672c\u7bc7\u6587\u7ae0\u5411&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200147","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200147","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200147"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200147\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}