sql 使用union出現問題
select a,b,c into #tb from table union select a,b,c into #tb2 from table2
select a,b,c into #tb from table select a,b,c into #tb2 from table2select * from #tbunionselect * from #tb2
[解决办法]
select a,b,c into #tb from table 是创建表并且插入数据,并不是查询结果
而union 是取那个结果集的并集 ,所以不能这样写
[解决办法]
select a,b,c into #tb from table select a,b,c into #tb2 from table2select * from #tbunion all --不过滤重复数据了select * from #tb2
[解决办法]
不能带着into 进行 union。