SQL Server组问号

2011-02-02 47 views 1 likes

CREATE TABLE #weeks(
    ProposalLineWeekID INT, 
    StartWeek DATETIME, 
    EndWeek DATETIME, 
    Selected BIT, 
    WeekNumber INT 
)

如何获取所有具有重复WeekNumber项ProposalLineWeekID值？例如

ProposalLineWeekID, WeekNumber 
------------------------------ 
2     22 
3     6 
4     22

我想获得ProposalLineWeekID 2和4伴随WeekNumber。

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2011-02-02 AngryHacker

回答

试试这个：

SELECT ProposalLineWeekID, WeekNumber 
FROM #Weeks 
WHERE WeekNumber IN 
( 
    SELECT WeekNumber 
    FROM #weeks 
    GROUP BY WeekNumber 
    HAVING COUNT(*) > 1 
)

子查询中找出所有重复的星期数和外部查询取出相应行。

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2011-02-02 18:41:34

+1，这也能发挥作用。不知道我的或你的解决方案哪一个在实践中表现会更好。 – 2011-02-02 18:53:32

如果我理解正确的话，我想这是你想要什么：

SELECT DISTINCT w1.ProposalLineWeekID, w1.WeekNumber 
FROM weeks w1 
INNER JOIN weeks w2 ON w2.WeekNumber = w1.WeekNumber 
    AND w2.ProposalLineWeekID <> w1.ProposalLineWeekID

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2011-02-02 18:43:56

+1，但你可能想要在给定周数重复两次以上的情况下将WeekNumber（OP要求的）和DISTINCT添加到`SELECT`子句 – 2011-02-02 18:49:29

SQL Server组问号

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