sql-server - MSSql 仅对计数大于 3 的记录进行分组并返回其余记录

Question

我想对计数大于3的键进行分组，查询也会返回其余的记录。我不想使用 Union All，还有其他方法吗？

ID
1
1
1
2
3
3
4
4
4
4

返回
1
1
1
2
3
3
4

Answer 1

您可以使用ranking- and aggregate functions :

WITH CTE AS
(
  SELECT ID, 
         CNT = COUNT(*)     OVER (PARTITION BY ID),
         RN  = ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID)
  FROM dbo.TableName
)
SELECT ID
FROM CTE
WHERE CNT <= 3 OR RN = 1

Demo