Can a table valued parameter to stored procedure have default values - sql

Question

Suppose that I have a two column User Defined Table type
CREATE TYPE [Schema].[Type] AS TABLE (
[Name] NVARCHAR (100) NULL
[Value] int NULL
);
Further suppose that I have stored procedure that I pass the table type to
CREATE PROCEDURE [Schema].[sp_SomeProcedure]
#TVP [Type] READONLY
AS
SELECT
[Name]
,1 + [Value]
FROM
#TVP
Can I default the value of #TVP to be
(SELECT 'John', 1)

Answer 1

You can use the 'DEFAULT' keyword for the TVP when calling the procedure. That will pass an empty table of the type.
Example - if the TVP is the second parameter passed to a procedure:
Exec myProcedure (intParam, DEFAULT)

Answer 2

SQL Server does not allow to make a TVP an optional parameter but setting some sort of default value to it, if you have a TVP in your procedure you will need to pass a TVP at runtime.
But there is a way around to it, add another parameter to your procedure which decides the behavior of TVP in your procedure.
Mind you in any case you would need to pass a TVP to your procedure at runtime.
CREATE PROCEDURE [Schema].[sp_SomeProcedure]
#TVP_Default BIT = 1
,#TVP [dbo].[Test_Type] READONLY
AS
BEGIN
DECLARE #tempTable TABLE (
[Name] NVARCHAR(100) NULL
,[Value] int NULL
);
-- If #TVP_Default = 1 default values will be populated
-- else values passed to TVP will be used
IF (#TVP_Default = 1)
BEGIN
INSERT INTO #tempTable([Name] , [Value])
SELECT 'John' , 1
END
ELSE
BEGIN
INSERT INTO #tempTable([Name] , [Value])
SELECT [Name]
,1 + [Value]
FROM #TVP
END
/*
rest of the code
use #tempTable instead of the TVP in rest of the code
*/
END