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This lesson will teach you how to use the aggregate function SUM(). If you haven't already read through Tizag's Aggregate Introduction Lesson, please check it out now. It explains concepts used in this lesson.

We will be using the "products" table again -- this time to display the use of MySQL's SUM function.

You can download the products.sql file from our website. If you are new to MySQL you will need to know how to Create a MySQL Table and Insert a MySQL Row.

Here's a visual of the "products" table.

Products Table:

123451 Park's Great Hits Music 19.99
123452 Silly Puddy Toy 3.99
123453 Playstation Toy 89.95
123454 Men's T-Shirt Clothing 32.50
123455 Blouse Clothing 34.97
123456 Electronica 2002 Music 3.99
123457 Country Tunes Music 21.55
123458 Watermelon Food 8.73

mysql sum - totaling groups

SUM is an aggregate function that totals a specific column for a group. The "products" table that is displayed above has several products of various types. One use of SUM might be to find the total of all the items' price for each product type.

Just as we did in the aggregate introduction lesson, we are going to apply the aggregate function to price and GROUP BY type to create four groups: Music, Toy, Clothing and Food.

PHP and MySQL Code:

// Make a MySQL Connection

$query = "SELECT type, SUM(price) FROM products GROUP BY type"; 
$result = mysql_query($query) or die(mysql_error());

// Print out result
while($row = mysql_fetch_array($result)){
	echo "Total ". $row['type']. " = $". $row['SUM(price)'];
	echo "<br />";


Total Clothing = $67.47
Total Food = $8.73
Total Music = $45.53
Total Toy = $93.94
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