SQL select group query

Question

Below is my Table

Table1

+--------+----------+---------+  
| amount | make     | product |  
+--------+----------+---------+  
|    100 | Nokia    | Mo         


        

Answer 1

You can use this solution to retrieve the "group-wise maximum" based on the amount:

SELECT a.*
FROM Table1 a
INNER JOIN Table1 b ON a.product = b.product AND a.amount <= b.amount
GROUP BY a.amount, a.product
HAVING COUNT(*) <= 2

Simply change the 2 to however many of the top rows you want to retrieve per product.

If you wanted to retrieve the lowest two rows per product, you can simply change the <= sign in the INNER JOIN to a >=.

You can fiddle around with this solution here: SQL-Fiddle Demo