如何在 SQL 存储过程中的声明变量中使用 Select？答案

【问题标题】：How can I use Select in a Declared variable within a TSQL Stored Procedure?如何在 SQL 存储过程中的声明变量中使用 Select？
【发布时间】：2016-04-20 07:15:18
【问题描述】：

我的 TSQL 存储过程中有这段代码：

CREATE Procedure [dbo].[priceVarianceTest]
    @Unit varchar(25),
    @BegDate datetime,
    @EndDate datetime 
AS 

DECLARE @Week1End datetime = DATEADD(Day, 6, @BegDate);
DECLARE @Week2Begin datetime = DATEADD(Day, 7, @BegDate);
DECLARE @MemberNo VarChar(25) = SELECT MEMBERNO FROM INVOICEDETAIL WHERE UNIT = @Unit;
DECLARE @MemberItemCode VarChar(50) = SELECT ITEMCODE FROM INVOICEDETAIL WHERE UNIT = @Unit;

...但它不会执行，说：

Msg 156, Level 15, State 1, Procedure priceVarianceTest, Line 9
Incorrect syntax near the keyword 'SELECT'.
Msg 156, Level 15, State 1, Procedure priceVarianceTest, Line 10
Incorrect syntax near the keyword 'SELECT'.

然后我想像这样插入这些 val：

INSERT INTO #temp1 (Unit, MemberNo, MemberItemCode) VALUES (@Unit, MemberNo, MemberItemCode);

...所以我也试过这个：

INSERT INTO #temp1 (Unit, MemberNo, MemberItemCode) VALUES (@Unit, SELECT MEMBERNO FROM INVOICEDETAIL WHERE UNIT = @Unit, MemberItemCode);

...但这并不比我之前的尝试更受欢迎。

那么，我怎样才能获得这些值。我的语法或方法有问题吗？

【问题讨论】：

标签： sql-server tsql select stored-procedures insert

【解决方案1】：

试试SELECT @variable = column:

DECLARE @MemberNo VarChar(25); 
SELECT @MemberNo = MEMBERNO FROM INVOICEDETAIL WHERE UNIT = @Unit;
DECLARE @MemberItemCode VarChar(50); 
SELECT @MemberItemCode = ITEMCODE FROM INVOICEDETAIL WHERE UNIT = @Unit;

或者更简单地说：

DECLARE @MemberNo VarChar(25); 
DECLARE @MemberItemCode VarChar(50); 
SELECT @MemberNo = MEMBERNO, 
       @MemberItemCode = ITEMCODE 
FROM INVOICEDETAIL WHERE UNIT = @Unit;

【讨论】：