Question

我在T-Sql中有一个存储过程，其末尾有这段代码：

UPDATE @Results
SET Percentage = CASE B.Total
WHEN 0 THEN 0
ELSE (CAST(Number AS FLOAT)/B.Total)
END
FROM @TotalAnswersPerQuestion AS B
WHERE @Results.QuestionNumber=B.QuestionNumber

在这些说明之前，临时表@Results已在此存储过程中定义并正确使用，但我在最后一行收到错误说：

Msg 137，Level 15，State 2，Procedure Report，111行必须声明标量变量“@Results”。

这是我的表格：

DECLARE @TotalAnswersPerQuestion Table
(QuestionNumber int,
Total int)

DECLARE @Results Table
(
    QuestionNumber int,
    QuestionTitle varchar(max),
    AnswerNumber int,
    AnswerLable varchar(max),
    ProfileGroupID int,
    [Name] varchar(255),
    Identifier varchar(20),
    Number int,
    Percentage float
)

怎么了？

Answer 1

UPDATE r
SET Percentage = 
    CASE B.Total
        WHEN 0 THEN 0
        ELSE (CAST(Number AS FLOAT)/B.Total)
    END
FROM @TotalAnswersPerQuestion AS B
INNER JOIN @Results r
ON r.QuestionNumber=B.QuestionNumber;

我对UPDATE FROM感到无耻！燃烧开始吧！

Answer 2

别名：

UPDATE r
SET Percentage = CASE B.Total
WHEN 0 THEN 0
ELSE (CAST(Number AS FLOAT)/B.Total)
END
FROM   @Results r
JOIN   @TotalAnswersPerQuestion AS B
ON     r.QuestionNumber=B.QuestionNumber

Answer 3

UPDATE r
SET Percentage = CASE B.Total
WHEN 0 THEN 0
ELSE (CAST(Number AS FLOAT)/B.Total)
END
FROM @Results r
,@TotalAnswersPerQuestion AS B
WHERE r.QuestionNumber=B.QuestionNumber

从Select更新中的T-Sql语法错误

3 个答案: