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› mysql使用 union all查询统计总数量
超酷小
发表于 2018-9-29 07:25:03
mysql使用 union all查询统计总数量
select sum(a.b) as num from (
select count() as b from table_1
union all
select count() as b from table_2
) as a(注意这里要取个别名)
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mysql使用 union all查询统计总数量