Arithmetic overflow on column sum in sql server

I’m trying to get a column total but when i run this query i get the following error. Any advice?

SELECT SUM(Size) as total
FROM  AllDocs
Where DirName LIKE 'sites/test/test%'


ERROR:
Msg 8115, Level 16, State 2, Line 1
Arithmetic overflow error converting expression to data type int.
Warning: Null value is eliminated by an aggregate or other SET operation.

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  • One Solution collect form web for “Arithmetic overflow on column sum in sql server”

    While all your sizes can fit into INT (up to 2^31 - 1), their SUM cannot.

    Cast them into BIGINT:

    SELECT  SUM(CAST(Size AS BIGINT)) as total
    FROM    AllDocs
    WHERE   DirName LIKE 'sites/test/test%'
    
    MS SQL Server is a Microsoft SQL Database product, include sql server standard, sql server management studio, sql server express and so on.