SQL：選擇未在另一列映射到值的ID

Question

我有表有兩列這樣的：

ROLE_ID  RESTRICTION_ID 
--------- --------------- 
2   null 
2   15 
2   null 
13   12 
13   null 
13   13 
555   null 
555   null 
555   null 
91   10 
91   12 
91   null 

我需要得到：

ROLE_ID  RESTRICTION_ID 
    --------- --------------- 
    555   null 
    555   null 
    555   null 

意義，我需要所有ROLE_ID沒有連接到任何RESTRICTION_ID。

如果在某些ROLE_ID的RESTRICTION_ID列中存在某個數字，那麼希望從select語句結果中排除ROLE_ID。

Answer 1

SELECT t1.* 
FROM 
    table t1 
    LEFT JOIN table t2 
    ON t1.ROLE_ID = t2.ROLE_ID 
    AND t2.RESTRICTION_ID IS NOT NULL 
WHERE 
    t2.ROLE_ID IS NULL 

只是因爲大家都在顯示WHERE IN（SELECT ...回答這裏是一種通過自加盟做....

而只是爲了顯示一種方式也可以是使用EXISTS做...

SELECT t1.* 
FROM 
    table t1 
WHERE 
    NOT EXISTS (SELECT * 
      FROM 
       table t2 
      WHERE 
       t1.ROLE_ID = t2.ROLE_ID 
       AND t2.RESTRICTION_ID IS NOT NULL) 

Answer 2

選擇行，其中resctriction_id爲空

select * from my_table 
where resctiction_id is null 
and role_id not in (select role_id from my_table where resctiction_id is not null) ; 

Answer 3

SELECT ROLE_ID, RESTRICTION_ID 
FROM Table 
WHERE 
ROLE_ID NOT IN (SELECT ROLE_ID FROM Table WHERE RESTRICTION_ID IS NOT NULL) 

Answer 4

SELECT ROLE_ID, RESTRICTION_ID 
FROM <Your Table> 
WHERE RESTRICTION_ID IS NULL 
AND ROLE_ID NOT IN 
(SELECT ROLE_ID FROM <Your Table> WHERE RESTRICTION_ID IS NOT NULL) sub 

Answer 5

Select role_id, restriction_id 
From Table 
Where role_id in (Select ROLE_ID 

From Table 
Group by ROLE_ID 
Having COUNT(RESTRICTION_ID)=0) 

更好也許......

Answer 6

下面應該讓你開始：

SELECT 
    role_id 
    , restriction_id 
FROM Data 
WHERE role_id NOT IN 
(SELECT 
    role_id 
    FROM Data 
    GROUP BY role_id 
    HAVING COUNT(restriction_id) > 0 
); 

如果需要調整/進一步的細節，請發表評論。

Answer 7

和監守在這裏您所標記的SQL是，沒有工作很好，以及公用表表達了窗口函數。

WITH cte AS (
    SELECT 
     * 
     ,COUNT(RESTRICTION_ID) OVER (PARTITION BY ROLE_ID) as CountOfRestrictionsIds 
    FROM 
     TableName 
) 

SELECT * 
FROM 
    cte 
WHERE 
    CountOfRestrictionsIds = 0 

Answer 8

數算全部

with t as (
    -- sample data 
    select 2 as ROLE_ID ,null as RESTRICTION_ID from dual union all 
    select 2 ,15 from dual union all 
    select 2 ,null from dual union all 
    select 13 ,12 from dual union all 
    select 13 ,null from dual union all 
    select 13 ,13 from dual union all 
    select 555 ,null from dual union all 
    select 555 ,null from dual union all 
    select 555 ,null from dual union all 
    select 91 ,10 from dual union all 
    select 91 ,12 from dual union all 
    select 91 ,null from dual 
) 
select ROLE_ID,RESTRICTION_ID 
from (
    select t.* 
     ,count(RESTRICTION_ID) over(partition by ROLE_ID) as cnt 
    from t 
    ) x 
where cnt=0;