Question

I’m trying to find a way to group prices in a database table by price “group”.
So my database table looks something like this:

+-------+------------------+
| Field | Type             |
+-------+------------------+
| id    | int(11) unsigned |
| name  | varchar(255)     |
| price | varchar(30)      |
+-------+------------------+

Those are the relevant fields in my database table.
What I’m trying to accomplish is to run a query that will group results by price range, so items that fall between $1 and $10 would go into group #1; $11 to $20 would go into price group #2, etc… so it should look like this:

+-------------+------------+
| price_group | item_count |
+-------------+------------+
| $1-$10      | 10         |
+-------------+------------+
| $11-$20     | 8          |
+-------------+------------+
| $21-$30     | 22         |
+-------------+------------+
| $31-$40     | 58         |
+-------------+------------+
| $41-$40     | 3          |
+-------------+------------+

I don’t have any code that I’ve tried because I’m not really sure where to begin on this. Still searching trying to find a clue.

Answer 1

You can group by the price (offset by 1 because of where you put your group divisions), divided by ten, cast to an integer. Consider the group $21-$30. If you subtract one, that will be $20-$29. Divide by ten (and cast to integer), anything in that group will return $2, giving you a constant for the price group.

SELECT CAST((price - 1) / 10 AS UNSIGNED) AS price_group, 
    SUM(item_count) as total_item_count
FROM table_name
GROUP BY price_group

Also note that I did SUM(item_count) to get the total for that group.

The price_group returned here will just be the tens digit. For example, for group “$21-$30”, price_group returned will be “2”.