将两条sql语句合并成一条

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你这种情况属于列集合并，实现如下： SELECT a.title,a.num,b.imm_num FROM (select date_format(time,'%Y-%m-%d') as title, count(*) as num from meter where 1=1)a, (select count(*) as imm_num from user u inner join meter m on u.id=m.userId and date_format(u.time,'%Y-%m-%d')=date_format(m.time,'%Y-%m-%d'))b 若是列集字段一样，涉及到记录集合并 只需在两个SELECT中加UNION ALL即可