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问题描述
DECLARE @TotalQuestions int;
DECLARE @CorrectQuestions int;
DECLARE @IncorrectQuestions int;
SELECT (
SET CorrectQuestion = SELECT COUNT( WiningComment)
FROM Threads
WHERE WiningComment IN (SELECT CommentsID
FROM Comments
WHERE UsersID=@UserID)
) as 'WinningAnswers',
(
SET TotalQuestions = SELECT COUNT(CommentsID)
FROM Comments
WHERE UsersID=@UserID
) as 'TotalAnswers'
(
SELECT (TotalQuestions-CorrectQuestions ) //I am not sure about this part!!
) as 'IncorrectQuestions'
我不知道最后一部分,我想从另一个子查询的结果减去一个子查询的结果
I am not sure about the last part, I want to subtract the results of one subquery from the results of another subquery
推荐答案
试试这个:
DECLARE @TotalQuestions int;
DECLARE @CorrectQuestions int;
DECLARE @IncorrectQuestions int;
SELECT @CorrectQuestions = COUNT( WiningComment)
FROM Threads
WHERE WiningComment IN (SELECT CommentsID
FROM Comments
WHERE UsersID=@UserID)
SELECT @TotalQuestions = COUNT(CommentsID)
FROM Comments
WHERE UsersID=@UserID
SELECT @IncorrectQuestions = (@TotalQuestions-@CorrectQuestions )
Select @CorrectQuestions as 'WinningAnswers',
@TotalQuestions as 'TotalAnswers',
@IncorrectQuestions as 'IncorrectQuestions'
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