Question

OK I have a column on my table called style_number. There can be duplicates of style_number. I want to select everything, but only up to 3 for each style number.

So for example if there are 4 rows that have a style_number = “style 7” only 3 of those 4 would be selected (doesn’t matter which 3, any 3).

Does this make sense?

How can I do that?

Thanks!!

Note: I am using 4.1.22

EDIT:
To clear some confusion. I need all the other columns as well, and I need more than just “style 7” or I could easily limit to 3. but for example if this where my table:

style_number | price | stone_count

"style 7" | 300 | 2
"style 7" | 400 | 3
"style 7" | 500 | 4
"style 7" | 600 | 5
"style 8" | 200| 1
"style 8" | 300 | 2

I would get this as a result:

"style 7" | 300 | 2
"style 7" | 400 | 3
"style 7" | 500 | 4
"style 8" | 200| 1
"style 8" | 300 | 2

Does that make better sense?

Answer 1

I’m not a MySQL developer, but I think that this will give you what you want. No promises on performance though 🙂

SELECT
     T1.id,
     T1.style_number,
     T1.col1,
     T1.col2,
     ...
FROM
     My_Table T1
WHERE
     (
          SELECT
               COUNT(*)
          FROM
               My_Table T2
          WHERE
               T2.style_number = T1.style_number AND
               T2.id < T1.id
     ) < 3