Question

So the question is how can i show the Supplier (S) that has the maximum quantity (QTY) from table SP.

This is what i came up with:

  SELECT sno FROM sp WHERE sno in (SELECT max(QTY) FROM sp WHERE qty);

but it is showing only empty field, and i cannot find the problem.
I would really appreciate your help.

Answer 1

SELECT a.* 
FROM tableA a
     INNER JOIN tableB b
        ON a.S = b.S
WHERE b.qty = (SELECT max(qty) FROM tableB)

• SQLFiddle Demo
• SQLFiddle Demo (with ties)