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  • Case When PK PIVOT


    SELECT *
    FROM ScoreInfo
    go

    Name Course Score
    ---------- ---------- -----------
    Lucy Chinese 74
    Jim Math 83
    Angkor English 93
    Tom Chinese 74
    Leon Math 84
    Evan English 94

    (6 row(s) affected)


    SELECT Name ,
    MAX(CASE Course
    WHEN 'Chinese' THEN Score
    ELSE 0
    END) Chinese ,
    MAX(CASE Course
    WHEN 'Math' THEN Score
    ELSE 0
    END) Math ,
    MAX(CASE Course
    WHEN 'English' THEN Score
    ELSE 0
    END) English
    FROM ScoreInfo
    GROUP BY name

    Name Chinese Math English
    ---------- ----------- ----------- -----------
    Angkor 0 0 93
    Evan 0 0 94
    Jim 0 83 0
    Leon 0 84 0
    Lucy 74 0 0
    Tom 74 0 0

    (6 row(s) affected)


    SELECT *
    FROM ScoreInfo PIVOT( MAX(Score) FOR Course IN ( Chinese, Math, English ) ) a

    Name Chinese Math English
    ---------- ----------- ----------- -----------
    Angkor NULL NULL 93
    Evan NULL NULL 94
    Jim NULL 83 NULL
    Leon NULL 84 NULL
    Lucy 74 NULL NULL
    Tom 74 NULL NULL

    (6 row(s) affected)

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  • 原文地址:https://www.cnblogs.com/wujiakun/p/3449714.html
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