具有特定条件的SQL组结果

Question

我需要选择并将其所有ConditionId值均为1

的ID分组

   ID     ConditionId
    2       0
    2       1
    2       0
    3       0
    3       0
    4       1
    4       1

结果应为：

ID     ConditionId             
4       1

我该怎么做？

Answer 1

这可以通过检查每个id的行数是否等于表中每个id的conditionid = 1的行数来完成。

select id
from tablename
group by id
having count(*) = count(case when conditionid = 1 then 1 end)

Answer 2

假设数据中只有0和1，这应该有效：

select id
from t
group by id
having min(ConditionId) = 1;

Answer 3

SELECT DISTINCT ID, ConditionId 
FROM Table 
WHERE ConditionId=1 
  AND ID NOT IN (SELECT ID FROM Table WHERE NOT ConditionId = 1)

Answer 4

我倾向于这样做：

select id
from t
group by id
having max(ConditionId) = min(ConditionId) and max(ConditionId) = 1;

Answer 5

select id
  from t
  group by id
  having sum(abs(1-ConditionId)) = 0;

或

select distinct id from t
minus
select distinct id from t where ConditionId <> 1;