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Finding the Max of another Max query

Maybe this helps:

SELECT t.client,
       MAX(t.serial) AS serial
  FROM(SELECT client,
              MAX(item) AS item
         FROM your_table
           BY client
      ) a
  JOIN your_table t
    ON a.client = t.client AND a.item = t.item
    BY t.client, t.item 

If your DBMS supports window functions, another way would be:

SELECT client, item, serial
  FROM(SELECT client, item, serial,
client ORDER BY item DESC, serial DESC) rn
         FROM your_table
 WHERE rn = 1

Categories : SQL

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