Question

我知道这个问题可能已得到解答，但我遇到的很多例子都涉及使用INNER JOIN将数据从一个表传输到另一个表，我的情况有点不同。

基本上我正在尝试将此SELECT语句转换为Update语句。

SELECT 
    SR, 100. * Cast(Round(AVG(Three_1 + Three_2 + Three_3 + Three_4 + Three_5 + Three_6 + Three_7 + Five_1 + Six_1 + Six_3) / 38,0) as int)
FROM 
    MainDB 
WHERE 
    Ctype = 'Call'
GROUP BY 
    SR

我能够成功计算一些列的百分比，然后我想用这些信息更新列。我的第一次尝试就是这个

UPDATE QAMainDB 
SET TCX_score = 100. * avg(three_1 + Three_2 + Three_3 + Three_4 + Three_5 + Three_6 + Three_7 + Five_1 + Six_1 + Six_3) / 38

我收到了错误：

聚合可能不会出现在UPDATE语句的集合列表中。

在做了更多的跟踪和错误后，我尝试了这种方法来声明Stack上的前一个例子的变量。

Declare @Result Decimal = 0

SET @Result = 100. * Cast(round(avg(three_1 + Three_2 + Three_3 +  Three_4 + Three_5 + Three_6 + Three_7 + Five_1 + Six_1 + Six_3) / 38,0) as int)

UPDATE QAMainDB
SET TCX_score = @Result
WHERE Ctype = 'Call'

但它失败了，我想知道你们中是否有人可以通过引导我朝着正确的方向帮助我。我对SQL很陌生，所以请耐心等待。

感谢您的时间。

Answer 1

你如何匹配列？我猜测SR是用于表之间匹配的列：

WITH m as (
      SELECT SR, 100. * Cast(Round(AVG(Three_1 + Three_2 + Three_3 + Three_4 + Three_5 + Three_6 + Three_7 + Five_1 + Six_1 + Six_3) / 38,0) as int) as val
      FROM MainDB 
      WHERE Ctype = 'Call'
      GROUP BY SR
     )
Update QAMainDB
    SET TCX_score = val
    FROM QAMainDB JOIN
         m
         ON m.SR = QAMainDB.SR;

Answer 2

尝试将您的代码更改为此代码。

Update QAMainDB SET  TCX_score = (select 100. * avg(three_1 + Three_2 + Three_3 + Three_4 + Three_5 + Three_6 + Three_7 + Five_1 + Six_1 + Six_3) / 38)

使用SQL Server

2 个答案: