Check if a parameter is null or empty in a stored procedure

Question

I know how to check if a parameter is null but i am not sure how to check if its empty ... I have these parameters and I want to check the previous parameters are empty or n

Answer 1

If you want to use a parameter is Optional so use it.

CREATE PROCEDURE uspGetAddress @City nvarchar(30) = NULL, @AddressLine1 nvarchar(60) = NULL
    AS
    SELECT *
    FROM AdventureWorks.Person.Address
    WHERE City = ISNULL(@City,City)
    AND AddressLine1 LIKE '%' + ISNULL(@AddressLine1 ,AddressLine1) + '%'
    GO