Count distinct value pairs in multiple columns in SQL

Question

What query will count the number of rows, but distinct by three parameters?

Example:

Id      Name        Address 
==============================
1     My         


        

Answer 1

To get a count of the number of unique combinations of id, name and address:

SELECT Count(*)
FROM   (
        SELECT DISTINCT
               id
             , name
             , address
        FROM   your_table
       ) As distinctified