Arithmetic Overflow Error Converting Varchar To Data Type Numeric.

An arithmetic overflow error converting varchar to data type numeric occurs when you try to convert or perform mathematical operations on a varchar data type that is too large to fit into a numeric data type.

This error commonly happens when you are trying to convert a varchar value to a numeric data type using functions like CAST or CONVERT, and the varchar value contains more digits or higher precision than the defined numeric data type can handle.

For example, let’s say you have a varchar column in your database called “Price” which contains prices in the format ‘123.45’. If you try to convert this varchar value to a numeric data type with a precision of 4 and scale of 2 (decimal(4,2)), it will work fine because the varchar value fits into the defined numeric data type:

        SELECT CAST('123.45' AS decimal(4,2)) AS ConvertedValue;
    

However, if you try to convert a varchar value that exceeds the defined precision and scale, you will get an arithmetic overflow error. For example, if you try to convert the varchar value ‘1234.5678’ to a decimal(4,2), it will result in an overflow error:

        SELECT CAST('1234.5678' AS decimal(4,2)) AS ConvertedValue;
    

The above query will throw an arithmetic overflow error because the varchar value ‘1234.5678’ has more digits than the numeric data type can handle.

To avoid this error, you need to ensure that the varchar value is compatible with the defined numeric data type. You can either change the definition of the numeric data type to accommodate the varchar value or truncate/round the varchar value to fit into the numeric data type before conversion.