SQL SERVER如何更新另一个表中存在的表中的所有行答案

【问题标题】：SQL SERVER How to UPDATE all rows in a table that exists in other tableSQL SERVER如何更新另一个表中存在的表中的所有行
【发布时间】：2017-06-20 01:29:02
【问题描述】：

我有这个 UPDATE SENTENCE 更新行，如果存在对每一行进行除法，每一行都有不同的 Rate/HR

UPDATE CP_ValueStream_Data
        SET
        CP_ValueStream_Data.W1 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W1 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate AS FLOAT),2)),
        CP_ValueStream_Data.W2 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W2 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W3 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W3 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W4 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W4 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W5 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W5 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W6 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W6 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W7 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W7 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W8 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W8 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W9 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W9 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W10 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W10 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W11 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W11 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W12 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W12 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        CP_ValueStream_Data.W13 = (SELECT ROUND(CAST((SELECT [CP_Demand_G&PS].W13 FROM [CP_Demand_G&PS]) AS FLOAT)/CAST(Rate_Hr AS FLOAT),2)),
        Active = 1
        FROM
            [CP_Demand_G&PS]
            INNER JOIN CP_ValueStream_Data 
        ON [CP_Demand_G&PS].RowLabels = CP_ValueStream_Data.Material

但是当我执行查询时返回一个错误

子查询返回超过 1 个值。当子查询跟随 =、!=、、>= 或子查询用作表达式时，这是不允许的。

【问题讨论】：

当您已经加入表格时，您不应该在 SET 部分中使用子查询。就= ROUND(CAST([CP_Demand_G&PS].W... AS FLOAT)/...)

标签： sql sql-server division exists

【解决方案1】：

您不需要子查询：

UPDATE CP_ValueStream_Data
    SET CP_ValueStream_Data.W1 = ROUND(CAST(d.W1 AS FLOAT)/CAST(Rate AS FLOAT), 2),
        . . .
        Active = 1
        FROM [CP_Demand_G&PS] d INNER JOIN 
             CP_ValueStream_Data v
             ON d.RowLabels = v.Material;

【讨论】：