SQL joining question

Question

Here is my situation:

I have one table that contains a list of drugs sold containing the NDC (an identifier), quantity sold, and whether the drug is a brand name or

Answer 1

This would get you each one on a separate line:

SELECT
  `cl`.`ndc`,
  `cl`.`rx_num`
FROM `claims_list` AS `cl`
WHERE `cl`.`ndc` IN
  (
    SELECT `dl`.`ndc` FROM `drug_list` AS `dl`
    WHERE `dl`.`type` = 'Generic'
    ORDER BY `dl`.`qty` DESC
    LIMIT 50
  )
ORDER BY `cl`.`date` DESC
LIMIT 4

Then run the results through a filter in the calling script to group them together.