Question

以下是MIN函数使用的代码片段。执行下面的代码时会出错。

CREATE FUNCTION [dbo].[FN_TempCalcTransportExemp]  
(
    @EmployeeID varchar(20),
    @PayElement varchar(20),
    @Month varchar(10),
    @FinYear varchar(10)
)
RETURNS decimal
AS
BEGIN
    DECLARE @TarnsportExemption decimal(18,2) = 0
    DECLARE @TDSIsFullExemption bit
    DECLARE @PermanentPhysicalDisability decimal(18,2) = 0
    DECLARE @UsingComapnyCar bit
    DECLARE @Conveyance decimal(18,2) = 0
    DECLARE @TransYes decimal(18,2) = 0
    DECLARE @TransNo decimal(18,2) = 0

    DECLARE @MinConveyance decimal(18,2) = 0
    DECLARE @MinTransport decimal(18,2) = 0

    SELECT 
        @TDSIsFullExemption = TDSDetailsFullExemption,
        @TransYes = TDSDetailsYes,
        @TransNo = TDSDetailsNo 
    FROM 
        tbl_TDSSettingDetails 
    WHERE
        TDSSettingsDetailID = 2 

    SELECT 
        @Conveyance = @Month 
    FROM
        tbl_Income 
    WHERE
        EmployeeID = @EmployeeID 
        AND Element = @PayElement 
        AND FinancialYear = @FinYear

    SELECT 
        @UsingComapnyCar = UsingCompanyCar,
        @PermanentPhysicalDisability = PermanentPhysicalDisability 
    FROM 
        tbl_Employee_TDS 
    WHERE
        EmployeeID = @EmployeeID  
        AND TDSFinancialYear = @FinYear

    IF (@TDSIsFullExemption = 1)
    BEGIN
        SET @TarnsportExemption = @Conveyance   
    END
    ELSE
    BEGIN
        IF (@UsingComapnyCar = 1)
        BEGIN
            IF (@Conveyance = 0)
            BEGIN
                SET @MinConveyance = 0
            END
            ELSE
            BEGIN
                SET @MinConveyance = @Conveyance
            END

            IF (@PermanentPhysicalDisability = 1)
            BEGIN
                SET @MinTransport = @TransYes
            END
            ELSE
            BEGIN
                SET @MinTransport = @TransNo
            END

            SET @TarnsportExemption = MIN(@MinConveyance, @MinTransport)
        END
        ELSE
        BEGIN
            SET @TarnsportExemption = 0
        END
    END

    RETURN @TarnsportExemption
END

错误讯息：

Msg 174，Level 15，State 1，Procedure FN_TempCalcTransportExemp，Line   66个
  MIN函数需要1个参数。

Answer 1

set @TarnsportExemption = MIN(@MinConveyance,@MinTransport) - MIN函数不是您认为的。

你可能想做这样的事情：

set @TarnsportExemption = CASE WHEN @MinConveyance < @MinTransport THEN 
                               @MinConveyance 
                          ELSE 
                               @MinTransport
                          END

另一种选择是：

SELECT @TarnsportExemption = MIN(val)
FROM 
(
    SELECT @MinConveyance as val
    UNION ALL
    SELECT @MinTransport as val
)

还有一个选择是使用values子句：

SELECT @TarnsportExemption = MIN(val) 
FROM (VALUES ( @MinConveyance), (@MinTransport)) AS value(val)

Answer 2

更改您的min语句，如下面MIN。请参阅MIN (Transact-SQL)

--fROM
set @TarnsportExemption = MIN(@MinConveyance,@MinTransport)

--To
SELECT @TarnsportExemption = MIN(A) FROM (
SELECT @MinConveyance A
UNION ALL
SELECT @MinTransport
)AS AA

Answer 3

在SQL中，MIN函数将返回所选列表中列的最小值;所以你只能在内联查询中使用MIN。

e.g。从Tbl_Employee
中选择min（Salary）

因此，在您的情况下，您可以使用case或者all all从两个变量中获取最小值： -

SET @TarnsportExemption = @MinConveyance＆lt; @MinTransport那么@MinConveyance ELSE @MinTransport END

OR

SELECT @TarnsportExemption = MIN（TEMPS。[VALUE]）   FROM（     选择@MinConveyance AS VALUE

UNION ALL

SELECT @MinTransport AS VALUE     ）AS TEMPS

MIN函数需要1个参数

3 个答案: