SQL-Server - Operand type clash: uniqueidentifier is incompatible with int

Question

When I am executing this code I am having this error. Operand type clash: uniqueidentifier is incompatible with int . What are the solutions to remove this error please? Thanks

CREATE FUNCTION [a01].[udf_isUserActive]
(@AccountID INTEGER)
    RETURNS BIT
    AS
    BEGIN
IF (EXISTS (SELECT  accountID
            FROM    [a01].[tbl_userAccounts]
            WHERE   accountID = @AccountID
                    AND isActive = 1))
    RETURN 1;

RETURN 0;
END;
GO

Answer 1

Most probably tbl_userAccounts has an AccountID of type UNIQUEIDENTIFIER and you are trying to compare @AccountID INTEGER with an UNIQUEIDENTIFIER .

Side note: you should provide the entire context: table schema and function call context. It is a big change that calling the function may also lead to performance problems as scalar functions are called per each selected row.