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

Making some assumptions, and I'm not sure the exact Oracle syntax....but what about:

SELECT
    "ndc" as NDC,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 0 ) as RX1,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 1 ) as RX2,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 2 ) as RX3,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 3 ) as RX4
FROM "drug_list"
ORDER BY qty ASC
LIMIT 4

NDC | RX1 | RX2 | RX3 | RX4
123   2332  2342  2346  7776