{"id":200777,"date":"2025-05-06T12:22:20","date_gmt":"2025-05-06T04:22:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200777\/"},"modified":"2025-05-06T12:22:20","modified_gmt":"2025-05-06T04:22:20","slug":"mysql8-%e4%b8%ad%ef%bc%8c%e4%b8%ba%e4%bd%95%e4%bd%bf%e7%94%a8%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%83%bd%e6%9f%a5%e8%af%a2-int-%e7%b1%bb%e5%9e%8b%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200777\/","title":{"rendered":"MySQL8 \u4e2d\uff0c\u4e3a\u4f55\u4f7f\u7528\u5b57\u7b26\u4e32\u80fd\u67e5\u8be2 int \u7c7b\u578b\u6570\u636e\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL8 \u4e2d\uff0c\u4e3a\u4f55\u4f7f\u7528\u5b57\u7b26\u4e32\u80fd\u67e5\u8be2 int \u7c7b\u578b\u6570\u636e\uff1f<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300aMySQL8 \u4e2d\uff0c\u4e3a\u4f55\u4f7f\u7528\u5b57\u7b26\u4e32\u80fd\u67e5\u8be2 int \u7c7b\u578b\u6570\u636e\uff1f\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241114\/17315679946735a17a4ccc3.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>mysql8\u4e2d\uff0c\u4e3a\u4f55where\u6761\u4ef6\u4f7f\u7528\u5b57\u7b26\u4e32\u80fd\u67e5\u8be2int\u7c7b\u578b\u6570\u636e\uff1f<\/strong><\/p>\n<p><strong>\u95ee\u9898\u6982\u8ff0\uff1a<\/strong><\/p>\n<p>\u6570\u636e\u5e93\u4e2d\u7684\u67d0\u4e00\u5217\u7c7b\u578b\u4e3aint\uff0c\u4f46where\u6761\u4ef6\u4f7f\u7528\u5b57\u7b26\u4e32\u5374\u80fd\u67e5\u8be2\u6210\u529f\uff0c\u5f15\u53d1\u7591\u95ee\u3002<\/p>\n<p><strong>\u5206\u6790\uff1a<\/strong><\/p>\n<p>mysql\u4e2d\u5b58\u5728\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u673a\u5236\u3002\u5f53\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\u65f6\uff0c\u4f1a\u81ea\u52a8\u5c06\u4e00\u79cd\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u79cd\u7c7b\u578b\uff0c\u4ee5\u8fdb\u884c\u6bd4\u8f83\u3002\u8fd9\u79cd\u60c5\u51b5\u5728where\u6761\u4ef6\u4e2d\u5c24\u4e3a\u5e38\u89c1\u3002<\/p>\n<p><strong>\u4e3e\u4f8b\uff1a<\/strong><\/p>\n<pre>select cast('m' as decimal);<\/pre>\n<p>\u4ee5\u4e0a\u793a\u4f8b\u4e2d\uff0c\u5b57\u7b26\u4e32&#8217;m&#8217;\u88ab\u9690\u5f0f\u8f6c\u6362\u4e3a\u5341\u8fdb\u5236\u7c7b\u578b0\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5e26\u6765\u7684\u95ee\u9898\uff0c\u5efa\u8bae\u5728where\u6761\u4ef6\u4e2d\u663e\u5f0f\u8f6c\u6362\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<pre>select * from students where gender = cast('M' AS TINYINT);<\/pre>\n<p>\u8fd9\u6837\uff0c\u786e\u4fddwhere\u6761\u4ef6\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u4e0e\u8868\u4e2d\u5217\u7684\u7c7b\u578b\u4e00\u81f4\uff0c\u907f\u514d\u9690\u5f0f\u8f6c\u6362\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aMySQL8 \u4e2d\uff0c\u4e3a\u4f55\u4f7f\u7528\u5b57\u7b26\u4e32\u80fd\u67e5\u8be2 int \u7c7b\u578b\u6570\u636e\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL8 \u4e2d\uff0c\u4e3a\u4f55\u4f7f\u7528\u5b57\u7b26\u4e32&#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-200777","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200777","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=200777"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200777\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}