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» sql中将两个表中数据相加求表中总数
erina.pan
发表于 2016-12-6 11:20
sql中将两个表中数据相加求表中总数
select sum(a) from
(
select COUNT(*) a from _aa2 union all
select COUNT(*) a from _aa1
) c
页:
[1]
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