{"id":6330,"date":"2024-11-14T09:00:40","date_gmt":"2024-11-14T01:00:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6330\/"},"modified":"2024-11-14T09:00:40","modified_gmt":"2024-11-14T01:00:40","slug":"mysql%e5%88%86%e9%a1%b5%e5%a6%82%e4%bd%95%e8%8e%b7%e5%be%97%e6%9c%80%e5%a4%a7%e9%a1%b5%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6330\/","title":{"rendered":"mysql\u5206\u9875\u5982\u4f55\u83b7\u5f97\u6700\u5927\u9875\u6570"},"content":{"rendered":"<blockquote><p>\n  \u83b7\u53d6 mysql \u5206\u9875\u4e2d\u7684\u6700\u5927\u9875\u6570\u6b65\u9aa4\u5982\u4e0b\uff1a\u786e\u5b9a\u6570\u636e\u96c6\u884c\u603b\u6570\u8bbe\u7f6e\u6bcf\u9875\u884c\u6570\u4f7f\u7528\u516c\u5f0f\u8ba1\u7b97\u6700\u5927\u9875\u6570\uff1a\u6700\u5927\u9875\u6570 = \u884c\u603b\u6570 \/ \u6bcf\u9875\u884c\u6570\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202407\/31\/2024073122485530627.jpg\" class=\"aligncenter\" title=\"mysql\u5206\u9875\u5982\u4f55\u83b7\u5f97\u6700\u5927\u9875\u6570\u63d2\u56fe\" alt=\"mysql\u5206\u9875\u5982\u4f55\u83b7\u5f97\u6700\u5927\u9875\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u83b7\u53d6 MySQL \u5206\u9875\u4e2d\u7684\u6700\u5927\u9875\u6570<\/strong><\/p>\n<p>\u5728 MySQL \u5206\u9875\u4e2d\u83b7\u5f97\u6700\u5927\u9875\u6570\u662f\u4e00\u4e2a\u5e38\u89c1\u4efb\u52a1\u3002\u8fd9\u5bf9\u4e8e\u6b63\u786e\u5206\u9875\u6570\u636e\u96c6\u5e76\u786e\u4fdd\u7528\u6237\u53ef\u4ee5\u8f7b\u677e\u5bfc\u822a\u7ed3\u679c\u96c6\u81f3\u5173\u91cd\u8981\u3002\u83b7\u53d6\u6700\u5927\u9875\u6570\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<p><strong>1. \u786e\u5b9a\u884c\u603b\u6570<\/strong><\/p>\n<p>\u9996\u5148\uff0c\u786e\u5b9a\u6570\u636e\u96c6\u4e2d\u7684\u884c\u603b\u6570\u3002\u53ef\u4ee5\u4f7f\u7528 COUNT(*) \u51fd\u6570\uff1a<\/p>\n<pre>SELECT COUNT(*) FROM table_name;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u8bbe\u7f6e\u6bcf\u9875\u884c\u6570<\/strong><\/p>\n<p>\u786e\u5b9a\u6bcf\u9875\u8981\u663e\u793a\u7684\u884c\u6570\u3002\u8fd9\u5c06\u5f71\u54cd\u6700\u5927\u9875\u6570\u3002<\/p>\n<p><strong>3. \u8ba1\u7b97\u6700\u5927\u9875\u6570<\/strong><\/p>\n<p>\u4f7f\u7528\u4ee5\u4e0b\u516c\u5f0f\u8ba1\u7b97\u6700\u5927\u9875\u6570\uff1a<\/p>\n<pre>\u6700\u5927\u9875\u6570 = \u884c\u603b\u6570 \/ \u6bcf\u9875\u884c\u6570<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6570\u636e\u96c6\u6709 1000 \u884c\uff0c\u6bcf\u9875\u663e\u793a 10 \u884c\uff0c\u5219\u6700\u5927\u9875\u6570\u4e3a\uff1a<\/p>\n<pre>\u6700\u5927\u9875\u6570 = 1000 \/ 10 = 100<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u56e0\u6b64\uff0c\u8fd9\u4e2a\u6570\u636e\u96c6\u7684\u6700\u5927\u9875\u6570\u4e3a 100\u3002<\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u7ed3\u679c\u662f\u6d6e\u70b9\u6570\uff0c\u5e94\u5411\u4e0a\u53d6\u6574\u4ee5\u83b7\u5f97\u6b63\u786e\u9875\u6570\u3002<\/li>\n<li>\u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\uff0c\u5efa\u8bae\u4f7f\u7528\u5206\u9875\u5e93\u6216\u6846\u67b6\u6765\u7ba1\u7406\u5206\u9875\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5206\u9875\u5982\u4f55\u83b7\u5f97\u6700\u5927\u9875\u6570\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>\u83b7\u53d6 mysql \u5206\u9875\u4e2d\u7684\u6700\u5927\u9875\u6570\u6b65\u9aa4\u5982\u4e0b\uff1a\u786e\u5b9a\u6570\u636e\u96c6\u884c\u603b\u6570\u8bbe\u7f6e\u6bcf\u9875\u884c\u6570\u4f7f\u7528\u516c\u5f0f\u8ba1\u7b97\u6700\u5927\u9875\u6570\uff1a\u6700\u5927\u9875\u6570 = \u884c\u603b\u6570 \/ \u6bcf\u9875\u884c\u6570 \u5982\u4f55\u83b7\u53d6 MySQL \u5206\u9875\u4e2d\u7684\u6700\u5927\u9875\u6570 \u5728 MySQL \u5206\u9875\u4e2d\u83b7\u5f97\u6700\u5927\u9875\u6570\u662f\u4e00\u4e2a\u5e38\u89c1\u4efb\u52a1\u3002\u8fd9\u5bf9\u4e8e\u6b63\u786e\u5206\u9875\u6570\u636e\u96c6\u5e76\u786e\u4fdd\u7528\u6237\u53ef\u4ee5\u8f7b\u677e\u5bfc\u822a\u7ed3\u679c\u96c6\u81f3\u5173\u91cd\u8981\u3002\u83b7\u53d6\u6700\u5927\u9875\u6570\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a 1. \u786e\u5b9a\u884c\u603b\u6570 \u9996\u5148\uff0c\u786e\u5b9a\u6570\u636e\u96c6\u4e2d\u7684\u884c\u603b\u6570\u3002\u53ef\u4ee5\u4f7f\u7528 COUNT(*) \u51fd\u6570\uff1a SELECT COUNT(*) FROM table_name; \u767b\u5f55\u540e\u590d\u5236 2. \u8bbe\u7f6e\u6bcf\u9875\u884c\u6570 \u786e\u5b9a\u6bcf\u9875\u8981\u663e\u793a\u7684\u884c\u6570\u3002\u8fd9\u5c06\u5f71\u54cd\u6700\u5927\u9875\u6570\u3002 3. \u8ba1\u7b97\u6700\u5927\u9875\u6570 \u4f7f\u7528\u4ee5\u4e0b\u516c\u5f0f\u8ba1\u7b97\u6700\u5927\u9875\u6570\uff1a \u6700\u5927\u9875\u6570 = \u884c\u603b\u6570 \/ \u6bcf\u9875\u884c\u6570 \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u5982\u679c\u6570\u636e\u96c6\u6709 1000 \u884c\uff0c\u6bcf\u9875\u663e\u793a 10 \u884c\uff0c\u5219\u6700\u5927\u9875\u6570\u4e3a\uff1a \u6700\u5927\u9875\u6570 = 1000 \/ 10 = 100 \u767b\u5f55\u540e\u590d\u5236 \u56e0\u6b64\uff0c\u8fd9\u4e2a\u6570\u636e\u96c6\u7684\u6700\u5927\u9875\u6570\u4e3a 100\u3002 \u6ce8\u610f\u4e8b\u9879\uff1a \u5982\u679c\u7ed3\u679c\u662f\u6d6e\u70b9\u6570\uff0c\u5e94\u5411\u4e0a\u53d6\u6574\u4ee5\u83b7\u5f97\u6b63\u786e\u9875\u6570\u3002 \u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\uff0c\u5efa\u8bae\u4f7f\u7528\u5206\u9875\u5e93\u6216\u6846\u67b6\u6765\u7ba1\u7406\u5206\u9875\u3002 \u4ee5\u4e0a\u5c31\u662f\u5206\u9875\u5982\u4f55\u83b7\u5f97\u6700\u5927\u9875\u6570\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-6330","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6330","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=6330"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6330\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}