我有三个变量:组变量var1和var2。每组,var2中的每个值都应存在于var1中。我想返回不是这种情况的所有组(因此,当var2未包含在var1中时,我希望知道每组)
例:
mygroup var1 var2
1 1 -
1 2 1
1 3 2
1 4 -
2 23 23
2 24 20
2 26 -
3 30 10
3 20 -
3 10 -
所以在这种情况下,我希望我的输出为组2,因为20不包含在var1中(在组2中)。
任何帮助将不胜感激。
使用不存在
select mygroup from table_name t1
where not exists( select 1 from table_name t2 where t1.var2=t2.var1
and t1.mygroup=t2.mygroup)
and t1.var2 is not null
另一种使用cte和temp表的方法:
试试以下:
create table #temp (mygroup int, var1 int, var2 int)
insert into #temp values
(1 , 1, null),
(1 , 2, 1),
(1 , 3, 2),
(1 , 4, null),
(2 , 23, 23 ),
(2 , 24, 20 ),
(2 , 26, null),
(3 , 30, 10),
(3 , 20, null),
(3 , 10, null)
;with cte as (
select t.mygroup, t.var1, t2.var2
from #temp t
inner join #temp t2 on t2.var2=t.var1 and t2.mygroup = t.mygroup
)
select var2
into #notIncludeList
from #temp
where var2 not in (select var1 from cte)
select mygroup
from #temp
where var2 in (select var2 from #notIncludeList)
group by mygroup
该解决方案适用于MsSql-2014。