Question

I have a table in Sql Server that contain an int field price that allow nulls.
I have created the following stored procedure:

CREATE PROCEDURE [dbo].[proc_test]
AS
    select a.id, a.product, case when a.price is null then 0 else a.price end
    from tblOne a
    ...

I have also created a linq to sql file that uses proc_test.

The problem is that auto generated linq to sql code in: designer.cs has a nullable price variable and Crystal Reports dosen’t allow nullable variables.

PS: I’m not allowed to change the structure of tblOne.

Answer 1

Use the IsNull() function instead of the case expression. Therefore change your stored procedure to be:

CREATE PROCEDURE [dbo].[proc_test]
AS
    select a.id, a.product, isnull(a.price, 0)
    from tblOne a
    ...

Note:

Coalesce is not suitable in this situation:

An expression involving ISNULL with non-null parameters is considered
to be NOT NULL, while expressions involving COALESCE with non-null
parameters is considered to be NULL. In SQL Server

http://msdn.microsoft.com/en-us/library/ms190349.aspx