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Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java 4 Mar 2019 MySQL Aggregate Functions Tutorial : SUM, AVG, MAX, MIN , COUNT, DISTINCT The COUNT function returns the total number of values in the specified field. It works SELECT DISTINCT `movie_id` FROM `movierentals`;. MySQL SUM. If you use the SUM() function in a SELECT statement that returns no matching row, the SUM() function returns NULL , not zero. The DISTINCT operator allows you to calculate distinct values in the set. The SUM() function ignores the NULL values in the calculation. You can completely handle it in the MySQL query: $sql = mysql_query("SELECT SUM(Value) as total FROM Codes"); $row = mysql_fetch_array($sql); $sum SUM is an aggregate function that totals a specific column for a group. SELECT SUM(total_cost) -> FROM purchase; +-----------------+