Pass Default value to Table Valued parameter - SQL Server

Question

I am using a table-valued parameter in one our stored procedures. Here is the syntax I used:

@districtlist NumericList readonly

(NumericList is the user-defined table type).

However, as a requirement I need to pass default values to this table valued parameter.

@districtlist NumericList = 0 readonly

But above code throws a syntax error. Is it possible to pass default value to a table valued parameter? Could someone help me on this?

Answer 1

You can pass the TVP as default:

EXEC dbo.Test_TVP @my_table = default

Which is the equivalent of an empty table.

Answer 2

You can opt to not pass the parameter, even if no default is defined for it. For example:

CREATE TYPE TestTable AS TABLE (my_id INT)
GO

CREATE PROCEDURE dbo.Test_TVP
    @my_table TestTable READONLY,
    @my_int INT
AS
BEGIN
    SELECT * FROM @my_table
END
GO

EXEC dbo.Test_TVP @my_int = 2
GO

DROP PROCEDURE dbo.Test_TVP
DROP TYPE TestTable

In this case the table will simply be empty. If you wanted some number of default rows then you would have to simulate that in the stored procedure, probably by using a temporary table since table-valued parameters must be READONLY.