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  • Sql 第一行某列减第二行某列

    --1. 将结果插入临时表
    SELECT
    *
    INTO xxx
    FROM(
    SELECT TOP 1 a.FQTY,a.fseq
    FROM T_SAL_ORDERENTRY as a
    WHERE FQTY=5
    UNION ALL
    SELECT TOP 1 b.FQTY,b.fseq
    FROM T_SAL_ORDERENTRY as b
    WHERE FQTY=1
    ) as c

    SELECT * FROM xxx

    --最初update
    -- UPDATE xxx
    -- SET FQTY = ISNULL((
    -- SELECT TOP 1 a.FQTY
    -- FROM xxx AS a
    -- WHERE t.fseq >= fseq
    -- AND FQTY=5
    -- )-(
    -- SELECT TOP 1 b.FQTY
    -- FROM xxx AS b
    -- WHERE t.fseq <fseq
    -- AND FQTY=1
    -- ),0)
    -- FROM xxx AS t

    --将记录1减记录2 ,新增至第3行
    INSERT INTO xxx
    SELECT ISNULL((
    SELECT TOP 1 a.FQTY
    FROM xxx AS a
    WHERE t.fseq >= fseq
    AND FQTY=5
    )-(
    SELECT TOP 1 b.FQTY
    FROM xxx AS b
    WHERE t.fseq <fseq
    AND FQTY=1
    ),0),t.fseq
    FROM xxx AS t
    WHERE fseq=1


    SELECT * FROM xxx

    DROP TABLE xxx

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  • 原文地址:https://www.cnblogs.com/BingLiVIP/p/11287407.html
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