SQL for Non-Programmers -- Homework Practice

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WITH PostingHistory AS 
   (SELECT OwnerUserId FROM Posts WHERE PostTypeId IN (1,2)
    AND CreationDate > DATEDIFF(month, -1, GETUTCDATE())
    ),
Commenting AS 
   (SELECT UserId FROM Comments 
    WHERE CreationDate > DATEDIFF(month, -1, GETUTCDATE())
    ),
Editing AS 
   (SELECT UserId FROM PostHistory 
    WHERE PostHistoryTypeId IN (4, 5, 6) 
    AND CreationDate > DATEDIFF(month, -1, GETUTCDATE())
    )
SELECT COUNT(*)
FROM Users
WHERE Users.Id IN (SELECT OwnerUserId FROM PostingHistory)
OR Users.Id IN (SELECT UserId FROM Commenting)
OR Users.Id IN (SELECT UserId FROM Editing)

Enter Parameters

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