算术溢出错误将数字转换为数据类型数字

Question

ALTER FUNCTION [dbo].[avgGpa]()
RETURNS decimal(3,2)
AS
BEGIN
    DECLARE @CalcGPA decimal(10,2)
    DECLARE @CalcGPA2 decimal(3,2)

    SELECT @CalcGPA = SUM(cast(GPA AS decimal(10,2))) from dbo.Students
    SELECT @CalcGPA2 = cast(ROUND((@CalcGPA / 1000),2) AS decimal(3,2))

    RETURN @CalcGPA2
END

Answer 1

提供更高的精确度值。

ALTER FUNCTION [dbo].[avgGpa]()    
RETURNS decimal(15,2)

Answer 2

通过将精度大于精度的值转换为转换值来引发错误。

以下是重现错误的示例：

   declare @d10 decimal(10,2)=12345678.12

   select CAST(@d10 as decimal(3,2))