错误：将数字转换为数据类型数字的算术溢出错误

Question

I'm getting error:

Arithmetic overflow error converting numeric to data type numeric on below code.

declare @A as   nvarchar(100)   --will be Nvarchar only
    declare @T as   nvarchar(100)     --will be Nvarchar only
    declare @Act as nvarchar(100) --will be Nvarchar only
    set @A ='750000'
    set @T ='552000'

    SELECT  @Act = cast(cast(cast(@A  AS decimal(10, 4)) -cast( @T AS decimal(10, 4)) 
    /cast(@T AS decimal(10, 4)) AS decimal(10, 4)) * 100 AS numeric(10, 4))

How to get ride of this error?

Answer 1

First of all, why are you using the wrong datatype and make things hard for you, you should always use the proper datatype.

So instead of VARCHAR why don't use DECIMAL , still here is the query since your question is How to get ride of this error

declare @A as   nvarchar(100)   --will be Nvarchar only
    declare @T as   nvarchar(100)     --will be Nvarchar only
    declare @Act as nvarchar(100) --will be Nvarchar only
    set @A ='750000'
    set @T ='552000'


SELECT @Act = CAST(
                    (
                      CAST(@A AS DECIMAL(10,4))-
                      CAST(@T AS DECIMAL(10,4))
                    ) /
                    (CAST(@T AS DECIMAL(10,4)) * 100)
                  AS VARCHAR);
SELECT @Act

No need to cast AS numeric(10, 4) and you need to cast to VARCHAR since you are assign the value to a varchar variable, not a numeric one.

Your query will be easy if you change the datatypes, eg:

DECLARE @A DECIMAL(10,4) = 750000,
        @T DECIMAL(10,4) = 552000,
        @Act VARCHAR(100);

SELECT @Act = CAST((@A - @T) / (@T * 100) AS VARCHAR(100))

SELECT @Act

Or if you want to cast the result as numeric(10, 4)

DECLARE @A DECIMAL(10,4) = 750000,
        @T DECIMAL(10,4) = 552000,
        @Act VARCHAR(100);

SELECT @Act = CAST(CAST((@A - @T) / (@T * 100) AS numeric(10, 4)) AS VARCHAR(100))

SELECT @Act

Answer 2

You need to increase the precision value higher. Try to change like this:

declare @A as   nvarchar(100)   --will be Nvarchar only
    declare @T as   nvarchar(100)     --will be Nvarchar only
    declare @Act as nvarchar(100) --will be Nvarchar only
    set @A ='750000'
    set @T ='552000'

    SELECT  @Act = cast(cast(cast(@A  AS decimal(18, 2)) -cast( @T AS decimal(18, 4)) 
    /cast(@T AS decimal(18, 4)) AS decimal(18, 4)) * 100 AS numeric(18, 4))

    print @Act

Answer 3

It is giving error because

The entire length of the number you have provided is greater than ten.

You can change your code as shown below 10, 4 to 18, 4 .

SELECT  @Act = cast(cast(cast(@A  AS decimal(10, 4)) -cast( @T AS decimal(10, 4)) 
    /cast(@T AS decimal(10, 4)) AS decimal(18, 4)) * 100 
    AS numeric(18, 4))

It's value is more than the max limit so it is giving exception.

Answer 4

If I understand your logic correctly, what you want to do with:

SELECT @Act = 
    cast(
        cast(
            cast(@A  AS decimal(10, 4)) - 
            cast(@T AS decimal(10, 4)) / cast(@T AS decimal(10, 4)) 
        AS decimal(10, 4)) 
        * 100
    AS numeric(10, 4))

is this simple calculation:

SELECT @Act = (@N1 - @N2/@N2) * 100

Then, in your case, you need to cast @Act as numeric(12, 4) , because you multiple by 100. Your result will be: 74999900.0000 .

I'm not sure, but I think that you probably want to calculate:

SELECT @Act = (@N1 - @N2)/@N2 * 100

Even then, as a rule, always consider the range of your math calculations and use appropriate numeric data type for your variables.