SQL with group by和having子句

Question

我有一张桌子A

ID   SALN  INDICATOR
  1    100    A
  2    100    B
  3    200    A
  4    200    C
  5    100    c
  6    300    B
  7    200    D

我需要在SALN分组后从表A中提取SALN，而该组只有指标A，B，C

SALN
100

请告诉我这个

的SQL

Answer 1

select saln
from A
where indicator in('A','B','C')
group by saln
having sum(indicator) = 100

Answer 2

select saln
from your_table
group by saln
having sum(indicator not in ('A','B','C')) = 0

如果您还需要检查SALN是否存在A，B和C，请添加

and sum(indicator  = 'A') > 0
and sum(indicator  = 'B') > 0
and sum(indicator  = 'C') > 0

到查询结尾。

Answer 3

如果你想要这三个值，那么你可以这样做：

select saln
from A
where indicator in ('A', 'B', 'C')
group by saln
having count(*) = 3;

如果可能有重复项，请使用：

having count(distinct indicator) = 3

如果你想要A，B和C而没有其他值，那么一种方法是：

select saln
from A
group by saln
having count(distinct case when indicator in ('A', 'B', 'C') then indicator end) = 3;