表中包含以下数据
Example Table
ID Value
1 a
1 b
1 c
2 a
2 b
2 c
3 a
3 b
我需要检索ID只有两个值a和b的记录。 所以我期待只有ID 3的记录。 任何人都可以帮我查询
答案 0 :(得分:0)
我想你可以做点像
select
ID,
sum(case when value = 'a' then 1
when value = 'b' then 1
else 3 end)
from
table1
group by id
having
sum (case when value = 'a' then 1
when value = 'b' then 1
else 3 end) =2
答案 1 :(得分:0)
这将有效:
select x.id from
(
select id from mytable where value = 'a'
union all
select id from mytable where value = 'b'
) x
group by x.id
having COUNT(*) = 2
and not exists (select * from mytable t where t.id = x.id and value <> 'a' and value <> 'b')