{"id":8545,"date":"2023-11-28T20:30:59","date_gmt":"2023-11-28T12:30:59","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=8545"},"modified":"2023-11-28T20:31:02","modified_gmt":"2023-11-28T12:31:02","slug":"mysql-zhong-shu-ju-ku-jing-chang-shi-yong-de-han-s","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/mysql-zhong-shu-ju-ku-jing-chang-shi-yong-de-han-s\/","title":{"rendered":"MySQL\u4e2d\u6570\u636e\u5e93\u7ecf\u5e38\u4f7f\u7528\u7684\u51fd\u6570\uff1f"},"content":{"rendered":"<p>1\u3001\tcount(*\/column):\u8fd4\u56de\u884c\u6570<br \/>\n2\u3001\tsum(column):\u8fd4\u56de\u6307\u5b9a\u5217\u4e2d\u552f\u4e00\u503c\u7684\u548c<br \/>\n3\u3001\tmax(column):\u8fd4\u56de\u6307\u5b9a\u5217\u6216\u8868\u8fbe\u5f0f\u4e2d\u7684\u6570\u503c\u6700\u5927\u503c<br \/>\n4\u3001\tmin(column):\u8fd4\u56de\u6307\u5b9a\u5217\u6216\u8868\u8fbe\u5f0f\u4e2d\u7684\u6570\u503c\u6700\u5c0f\u503c<br \/>\n5\u3001\tavg(column):\u8fd4\u56de\u6307\u5b9a\u5217\u6216\u8868\u8fbe\u5f0f\u4e2d\u7684\u6570\u503c\u5e73\u5747\u503c<br \/>\n6\u3001\tdate(Expression):\u8fd4\u56de\u6307\u5b9a\u8868\u8fbe\u5f0f\u4ee3\u8868\u7684\u65e5\u671f\u503c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001 count(*\/column):\u8fd4\u56de\u884c\u6570 2\u3001 sum(column):\u8fd4\u56de\u6307\u5b9a\u5217\u4e2d\u552f\u4e00\u503c\u7684\u548c 3\u3001 m [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[],"class_list":["post-8545","post","type-post","status-publish","format-standard","hentry","category-db"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=8545"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8545\/revisions"}],"predecessor-version":[{"id":8546,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8545\/revisions\/8546"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=8545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=8545"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=8545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}