Question

我的表格有两列，如下所示：

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

意思是，我需要所有没有连接到任何RESTRICTION_ID的ROLE_ID。

如果某个ROLE_ID的RESTRICTION_ID列中有一些数字，则希望从select语句结果中排除ROLE_ID。

Answer 1

选择resctriction_id为空的行

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 2

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

仅仅因为其他人都在显示WHERE IN（选择...这里的答案是一种通过自我加入来实现的方式......

只是为了表明使用EXISTS可以完成的一种方式......

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 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)

更好的可能......

Answer 6

以下内容可以帮助您入门：

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
 );

请评论是否需要调整/进一步详细说明。

Answer 7

并且因为你在这里标记了SQL是一个具有公共表表达式的Window函数，它也可以很好地完成工作。

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

SELECT *
FROM
    cte
WHERE
    CountOfRestrictionsIds = 0

Answer 8

全部算上

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;

SQL：选择未映射到另一列中的值的ID

8 个答案: