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Adding together values from database

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$sql500="SELECT * FROM $tbl_name3 WHERE product_id='$product_id'";
$review_product_rating_total=$review_product_rating; //What do I do here?


I need a way to take a column of product ratings (0-5 in 1/2 increments), add them together, and divide by the number of rows taken from the database. I know how to get the number of rows with mysql_num_rows. But how would I add together the data from database?

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