Question

我正在尝试开发一个T-SQL存储过程并在那里执行一些逻辑和计算，但由于某种原因导致语法错误。我将突出关键的地方，我不知道该怎么做。

CREATE PROC AddInvestment
@_Investor nvarchar(89),
@_Sum decimal(19,4),
@_Currency smallint,
@_Rate tinyint,
@_Date date,
@_Comment nvarchar(max)

AS

DECLARE @_MavroRate decimal(19,4)
DECLARE @_Mavro decimal(19,4)

SELECT mr.[40] INTO @_MavroRate <==== ERROR
FROM dbo.MavroRateBuy mr
WHERE mr.Date = @_Date

@_Mavro = _Sum / @_MavroRate <==== ERROR

INSERT INTO Investments(Investor, Sum, Currency, Rate, Date, Mavro, MavroRate, Comment)
VALUES (@_Investor, @_Sum, @_Currency, @_Rate, @_Date, @_Mavro, @_MavroRate, @_Comment)

请你通过T-SQL声明验证并指出我在这里做错了什么。

谢谢！

Answer 1

我想这样的事情：

SELECT @_MavroRate = mr.[40]  
FROM dbo.MavroRateBuy mr
WHERE mr.Date = @_Date

SELECT @_Mavro = @_Sum / @_MavroRate

@_ Sum在使用之前需要有一个值。

Answer 2

试试这个：

CREATE PROC AddInvestment
@_Investor nvarchar(89),
@_Sum decimal(19,4),
@_Currency smallint,
@_Rate tinyint,
@_Date date,
@_Comment nvarchar(max)

AS

DECLARE @_MavroRate decimal(19,4)
DECLARE @_Mavro decimal(19,4)

SELECT @_MavroRate = mr.[40]
FROM dbo.MavroRateBuy mr
WHERE mr.Date = @_Date

SET @_Mavro = @_Sum / @_MavroRate

INSERT INTO Investments(Investor, Sum, Currency, Rate, Date, Mavro, MavroRate, Comment)
VALUES (@_Investor, @_Sum, @_Currency, @_Rate, @_Date, @_Mavro, @_MavroRate, @_Comment)

Answer 3

您错过了SET行前面的@_Mavro = _Sum / @_MavroRate。它应该看起来像下面的代码。

SET @_Mavro = _Sum / @_MavroRate

此外，INTO用于将结果插入新表中，而不是设置变量。下面的代码是在select语句中设置变量的正确方法。

SELECT @_MavroRate = mr.[40]
FROM dbo.MavroRateBuy mr
WHERE mr.Date = @_Date

T-SQL存储过程构造

3 个答案: