Question

有人可以建议我查询以获得2列的合并计数。我的具体要求如下：

A     B       Permission
--------------------------
1     2       accept   
2     3       accept   
3     4       accept   
1     6       accept   
1     4       accept   
2     1       accept   
3     1       accept   
4     1       pending

我希望计数为1是否属于A或B且权限为“accept”。对于上面的示例，我需要输出为5

Answer 1

您可以通过使用UNION ALL首先对数据进行非规范化，然后使用COUNT来实现所需的结果来实现此目的：

WITH SampleData(A, B, Permission) AS(
    SELECT 1, 2, 'accept' UNION ALL
    SELECT 2, 3, 'accept' UNION ALL
    SELECT 3, 4, 'accept' UNION ALL
    SELECT 1, 6, 'accept' UNION ALL
    SELECT 1, 4, 'accept' UNION ALL
    SELECT 2, 1, 'accept' UNION ALL
    SELECT 3, 1, 'accept' UNION ALL
    SELECT 4, 1, 'pending'
)
SELECT
    t.ColValue,
    ValueCount = COUNT(*)
FROM (
    SELECT
         Col = 'A', ColValue = A, Permission
    FROM SampleData
    UNION ALL
    SELECT
         Col = 'B', ColValue = B, Permission
    FROM SampleData
) t
WHERE Permission = 'accept'
GROUP BY t.ColValue

<强> RESULT

ColValue    ValueCount
----------- -----------
1           5
2           3
3           3
4           2
6           1

Answer 2

SELECT COUNT(*) FROM table WHERE (A=1 OR B=1) AND Permission LIKE 'accept'

你是说这个？

Answer 3

我得到了答案并将其更改为postgre：

WITH SampleData(auid, buid, permission) AS(
 SELECT 1, 2, 'accept' UNION ALL
 SELECT 2, 3, 'accept' UNION ALL
 SELECT 3, 4, 'accept' UNION ALL
 SELECT 1, 6, 'accept' UNION ALL
 SELECT 1, 4, 'accept' UNION ALL
 SELECT 2, 1, 'accept' UNION ALL
 SELECT 3, 1, 'accept' UNION ALL
 SELECT 4, 1, 'pending')
 SELECT  t.col,   COUNT(*)as count 
 FROM (
  SELECT  auid as col, permission  FROM SampleData
  UNION ALL
  SELECT  buid as col, permission  FROM SampleData
 ) t
 WHERE permission = 'accept'
 GROUP BY t.col

<强>结果

col          count
-----------  -----------
1            5
2            3
3            3
4            2
6            1

Answer 4

正如您所说的A或B，我认为当您在A中有1时，在B中它意味着1计数;所以我建议这个编辑过的查询？

SELECT M, COUNT(*) As C 
FROM (
    SELECT A as M, Permission
    FROM yourTable
    UNION ALL
    SELECT B, Permission
    FROM yourTable 
    WHERE A <> B) Dt
WHERE Permission = 'accept'
GROUP BY M

如何在sql中选择超过2列的数量

4 个答案: