{"id":5866,"date":"2013-11-25T14:14:35","date_gmt":"2013-11-25T06:14:35","guid":{"rendered":"http:\/\/jpuyy.com\/?p=5866"},"modified":"2013-11-25T14:14:35","modified_gmt":"2013-11-25T06:14:35","slug":"mysql-count-usage","status":"publish","type":"post","link":"https:\/\/jpuyy.com\/?p=5866","title":{"rendered":"mysql count\u7528\u6cd5"},"content":{"rendered":"<p>\u5176\u5b9e\u4e5f\u662f\u4f7f\u7528\u4e86select\u547d\u4ee4<\/p>\n<p>\u67e5\u8be2\u8868\u4e2d\u6709\u591a\u5c11\u6761\u8bb0\u5f55<\/p>\n<pre>select count(*) from table-user;<\/pre>\n<p>\u4e0a\u9762\u4f7f\u7528\u4e86count(*)\u4f1a\u4f7f\u6574\u5f20\u8868\u52a0\u8f7d\u5230\u5185\u5b58\uff0c\u67e5\u8be2\u6548\u7387\u8f83\u4f4e\uff0c\u6bd5\u7adf\u662f\u7edf\u8ba1\u6570\u91cf\uff0c\u4f7f\u7528count(ID)\u5373\u53ef\uff0c\u5982<\/p>\n<pre>select count(ID) from table-user;<\/pre>\n<p>\u7528\u6237\u7537\u5973\u6570\u91cf\u7edf\u8ba1<\/p>\n<pre>select sex,count(ID) from table-user GROUP BY sex;<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5176\u5b9e\u4e5f\u662f\u4f7f\u7528\u4e86select\u547d\u4ee4 \u67e5\u8be2\u8868\u4e2d\u6709\u591a\u5c11\u6761\u8bb0\u5f55 select count(*) from table-user; \u4e0a\u9762\u4f7f\u7528\u4e86count(*)\u4f1a\u4f7f\u6574\u5f20\u8868\u52a0\u8f7d\u5230\u5185\u5b58\uff0c\u67e5\u8be2\u6548\u7387\u8f83\u4f4e\uff0c\u6bd5\u7adf\u662f\u7edf\u8ba1\u6570\u91cf\uff0c\u4f7f\u7528count(ID)\u5373\u53ef\uff0c\u5982 select count(ID) from table-user; \u7528\u6237\u7537\u5973\u6570\u91cf\u7edf\u8ba1 select sex,count(ID) from table-user GROUP BY sex;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,65],"tags":[],"class_list":["post-5866","post","type-post","status-publish","format-standard","hentry","category-life","category-mysql"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/5866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5866"}],"version-history":[{"count":4,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/5866\/revisions"}],"predecessor-version":[{"id":5891,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/5866\/revisions\/5891"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}