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declare @dt datetime
set @dt=getdate()
select top 1000 * from Table_1
union all
select datediff(ms,@dt,getdate()),null,null,null--要有跟表一样的列数和类型才能合并
declare @dt datetime
set @dt=getdate()
select top 1000 *,
(select datediff(ms,@dt,getdate())) as ms
from Table_1