具有計數和列查詢的組合

Question

我有一個連接表與兩列組合主鍵。 我想查詢所有條目

columnA having count > 1 

和

columnB = value1 and value2 

我的查詢到目前爲止是這樣的

select 
    columnA 
from tableA 
where columnB = 1 and 
columnA in (
     select 
      columnA 
     from tableA 
     group by columnA 
     having count(columnA) > 1) 

或

select 
     columnA 
    from tableA 
    where columnB = 2 and 
    columnA in (
      select 
       columnA 
      from tableA 
      group by columnA 
      having count(columnA) > 1) 

我如何可以查詢

...columnB = 1 and columnB = 2 and columnA in (select .... 

Answer 1

select columnA 
from tableA 
where columnB in (1,2) 
group by columnA 
having count(distinct columnB) = 2 

有兩個值1和2在columnB fullfills自動count(columnA) > 1

如果你想要麼的columnB條件（columnB有2個值）或的columnA條件，那麼做

select columnA 
from tableA 
group by columnA 
having count(*) > 1 
or count(distinct columnB) = 2 

或columnB必須1和2

select columnA 
from tableA 
group by columnA 
having count(*) > 1 
or 
( 
    sum(case when columnB = 1 then 1 else 0 end) > 0 and 
    sum(case when columnB = 2 then 1 else 0 end) > 0 
)