mysql count group by统计条数方法
2017-01-11 18:03
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mysql count group by统计条数方法 mysql 分组之后如何统计记录条数? gourp by 之后的 count,把group by查询结果当成一个表再count一次 select count(*) as count from (SELECT count(*) FROM 表名 WHERE 条件 GROUP BY id ) a; 实战例子: select count(*) as total from (select count(*) from users group by user_id) u
SELECT count(*) from (SELECT post_ask.ask_id,post_ask.ask_body,post_ask.ask_user,post_answer.answer_body,post_answer.answer_user from post_ask right JOIN post_answer on post_ask.ask_id = post_answer.ask_id and post_answer.answer_body is not null where post_ask.ask_id
is not null and post_ask.ask_body <>'' GROUP BY post_ask.ask_id ) as u
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