查詢檢索所有相關的值都爲空組

Question

我有以下幾點：

| Group_ID | Value | 
|----------|-------| 
|  146 | A | 
|  146 | B | 
|  239 | NULL | 
|  239 | F | 
|  826 | NULL | 
|  826 | NULL | 

我需要檢索僅具有所有相關的值無效的ID。 在這個例子中，輸出將是​​。

我知道這似乎是一個簡單的查詢，但我很長時間以來一直在努力。

Answer 1

select group_id 
from t 
group by group_id having sum(case when value is null then 1 end)=count(*) 

Answer 2

這應做到：

select t1.group_id 
from foo t1 
group by t1.group_id 
having count(*) = (select count(*) 
        from foo t2 
        where t2.group_id = t1.group_id 
        and t2.value is null); 

SQLFiddle例如：http://sqlfiddle.com/#!15/7d228/1

Answer 3

SELECT DISTINCT Group_ID 
FROM Your_Table a 
WHERE Value IS NULL 
    AND NOT EXISTS (
        SELECT NULL 
        FROM  Your_Table b 
        WHERE Value IS NOT NULL 
         AND b.Group_ID = a.Group_ID 
        ) 

Answer 4

試試這個：

select distinct Group_id 
from test 
where value is null 
    and Group_id not in (select Group_id from test where value is not null)