{"id":7143,"date":"2024-11-14T09:33:40","date_gmt":"2024-11-14T01:33:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/7143\/"},"modified":"2024-11-14T09:33:40","modified_gmt":"2024-11-14T01:33:40","slug":"%e6%9f%a5%e8%af%a2%e5%b0%8f%e4%ba%8e%e7%ad%89%e4%ba%8e%e6%8c%87%e5%ae%9a%e6%9c%88%e4%bb%bd%e7%9a%84%e6%9c%80%e4%bd%b3%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/7143\/","title":{"rendered":"\u67e5\u8be2\u5c0f\u4e8e\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173051786377361.jpg\" class=\"aligncenter\" title=\"\u67e5\u8be2\u5c0f\u4e8e\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\u63d2\u56fe\" alt=\"\u67e5\u8be2\u5c0f\u4e8e\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong> \u8bbe\u8ba1\u57fa\u7840\u95ee\u7b54<\/strong><\/p>\n<p><strong>\u4f18\u5316\u5c0f\u4e8e\u6216\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u67e5\u8be2<\/strong><\/p>\n<p>\u95ee\u9898\u573a\u666f\uff1a\u5df2\u6709\u4e00\u4e2a\u8868\u5305\u542b\u6708\u4efd\u6570\u636e\uff0c\u9700\u8981\u67e5\u8be2\u5c0f\u4e8e\u6216\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\uff089\uff09\u7684\u4e00\u4e2a\u6708\u4efd\u3002<\/p>\n<p><strong>\u65b9\u6cd5\u5bf9\u6bd4<\/strong><\/p>\n<p><strong>\u65b9\u6cd5\u4e00\uff1a<\/strong><\/p>\n<pre>select max(month) from newtabel where month &lt;= 9<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u65b9\u6cd5\u4e8c\uff1a<\/strong><\/p>\n<pre>select month from newtabel where month &lt;= 9 order by month desc limit 1<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6570\u636e\u91cf\u5f71\u54cd<\/strong><\/p>\n<p>\u6570\u636e\u91cf\u8f83\u5c0f\u65f6\uff0c\u4e24\u79cd\u65b9\u6cd5\u6027\u80fd\u5dee\u5f02\u4e0d\u5927\u3002\u4f46\u5f53\u6570\u636e\u91cf\u8f83\u5927\u65f6\uff0c<strong>\u65b9\u6cd5\u4e00\u66f4\u4f18<\/strong>\u3002<\/p>\n<p>\u539f\u56e0\uff1a\u65b9\u6cd5\u4e00\u4f7f\u7528 max()\uff0c\u5b83\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f18\u5316\u67e5\u8be2\u3002\u5728month\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\u540e\uff0c\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u6ee1\u8db3\u6761\u4ef6\u7684\u6700\u5927\u503c\uff0c\u4ece\u800c\u51cf\u5c11\u6570\u636e\u626b\u63cf\u91cf\u3002<\/p>\n<p><strong>\u5176\u4ed6\u4f18\u5316\u65b9\u5f0f<\/strong><\/p>\n<ol>\n<li> <strong>\u4f7f\u7528\u5b58\u50a8\u8fc7\u7a0b\uff1a<\/strong>\u53ef\u4ee5\u5c06\u67e5\u8be2\u5c01\u88c5\u6210\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4ece\u800c\u51cf\u5c11\u670d\u52a1\u5668\u7aef\u7f16\u8bd1\u6b21\u6570\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n<li> <strong>\u7d22\u5f15\u4f18\u5316\uff1a<\/strong>\u786e\u4fdd\u5728month\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u52a0\u5febmax()\u805a\u5408\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n<p><strong>mysql \u6d4b\u8bd5\u5de5\u5177<\/strong><\/p>\n<p><strong>expln\uff1a<\/strong>\u7528\u4e8e\u5206\u6790 sql \u67e5\u8be2\u5e76\u63d0\u4f9b\u4f18\u5316\u5efa\u8bae\u3002<br \/><strong>sysbench\uff1a<\/strong>\u4e00\u79cd\u7528\u4e8e\u57fa\u51c6\u6d4b\u8bd5 mysql \u6027\u80fd\u7684\u5f00\u6e90\u5de5\u5177\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u67e5\u8be2\u5c0f\u4e8e\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\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>\u8bbe\u8ba1\u57fa\u7840\u95ee\u7b54 \u4f18\u5316\u5c0f\u4e8e\u6216\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u67e5\u8be2 \u95ee\u9898\u573a\u666f\uff1a\u5df2\u6709\u4e00\u4e2a\u8868\u5305\u542b\u6708\u4efd\u6570\u636e\uff0c\u9700\u8981\u67e5\u8be2\u5c0f\u4e8e\u6216\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\uff089\uff09\u7684\u4e00\u4e2a\u6708\u4efd\u3002 \u65b9\u6cd5\u5bf9\u6bd4 \u65b9\u6cd5\u4e00\uff1a select max(month) from newtabel where month &lt;= 9 \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5\u4e8c\uff1a select month from newtabel where month &lt;= 9 order by month desc limit 1 \u767b\u5f55\u540e\u590d\u5236 \u6570\u636e\u91cf\u5f71\u54cd \u6570\u636e\u91cf\u8f83\u5c0f\u65f6\uff0c\u4e24\u79cd\u65b9\u6cd5\u6027\u80fd\u5dee\u5f02\u4e0d\u5927\u3002\u4f46\u5f53\u6570\u636e\u91cf\u8f83\u5927\u65f6\uff0c\u65b9\u6cd5\u4e00\u66f4\u4f18\u3002 \u539f\u56e0\uff1a\u65b9\u6cd5\u4e00\u4f7f\u7528 max()\uff0c\u5b83\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f18\u5316\u67e5\u8be2\u3002\u5728month\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\u540e\uff0c\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u6ee1\u8db3\u6761\u4ef6\u7684\u6700\u5927\u503c\uff0c\u4ece\u800c\u51cf\u5c11\u6570\u636e\u626b\u63cf\u91cf\u3002 \u5176\u4ed6\u4f18\u5316\u65b9\u5f0f \u4f7f\u7528\u5b58\u50a8\u8fc7\u7a0b\uff1a\u53ef\u4ee5\u5c06\u67e5\u8be2\u5c01\u88c5\u6210\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4ece\u800c\u51cf\u5c11\u670d\u52a1\u5668\u7aef\u7f16\u8bd1\u6b21\u6570\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002 \u7d22\u5f15\u4f18\u5316\uff1a\u786e\u4fdd\u5728month\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u52a0\u5febmax()\u805a\u5408\u64cd\u4f5c\u3002 mysql \u6d4b\u8bd5\u5de5\u5177 expln\uff1a\u7528\u4e8e\u5206\u6790 sql \u67e5\u8be2\u5e76\u63d0\u4f9b\u4f18\u5316\u5efa\u8bae\u3002sysbench\uff1a\u4e00\u79cd\u7528\u4e8e\u57fa\u51c6\u6d4b\u8bd5 mysql \u6027\u80fd\u7684\u5f00\u6e90\u5de5\u5177\u3002 \u4ee5\u4e0a\u5c31\u662f\u67e5\u8be2\u5c0f\u4e8e\u7b49\u4e8e\u6307\u5b9a\u6708\u4efd\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-7143","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7143","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=7143"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7143\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=7143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=7143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=7143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}