SQL function as default parameter value?

Question

I tried changing a default parameter value with this:

ALTER PROCEDURE [dbo].[my_sp]
@currentDate datetime = GETDATE()

and all the SQL pre-c

Answer 1

I infer you're using Microsoft SQL Server from the square brackets in your example.

From MSDN:

Only a constant value, such as a character string; a scalar function (either a system, user-defined, or CLR function); or NULL can be used as a default.

The function GETDATE() returns a different value from time to time, so it is not a constant expression.

Answer 2

You can try as follow:

Set @CurrentDate=IsNull(@CurrentDate,GetDate())

Answer 3

That value is not deterministic and cannot be used

Answer 4

Suggestion:

Set the default to NULL

Do the Default GETDATE() in the front end.

Answer 5

I don't think that is possible, you have to use a literal (constant) value as the default.

However you can do this:

Set @currentDate = Coalesce(@currentDate , GetDate())

Answer 6

Default value for stored procedures parameter have to be constants. You'd need to do the following...

ALTER Procedure [dbo].[my_sp]
@currentDate datetime = null
AS
IF @currentDate is null
SET @currentDate = getdate()