Nov 6, 2014

How do you get the number of rows affected by query?

SELECT COUNT (user_id) FROM users would only return the number of user_id’s.
If the value in the column is repeatable, how do you find out the unique values? 
Use DISTINCT in the query, such as SELECT DISTINCT user_firstname FROM users; You can also ask for a number of distinct values by saying SELECT COUNT (DISTINCT user_firstname) FROM users;


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