php - How can I update multiple mysql columns of a row using the result of a select query?
I have a reviews table that contains three ways to rate an item. The items themselves then have three columns to hold the average for each value respectively.
I could do this using three nested queries in an update query, but I feel like this is inefficient... Is there a way to update them all at once?
So far I've used this as my select query:
SELECT AVG(rating_1),AVG(rating_2),AVG(rating_3) FROM items_reviews WHERE item_id = 1
I just don't know how to use the result of that query to update an item row.
You could use an join in the