sql - Postgres Self Join query -


the db schema along sample data -

country table

| country | country code |  --------------------------     abc         ae      bcd         rw

dest table

| destcountry code | destcurrency code | totaldestamount | ----------------------------------------------------------       rw                  usd                  3600       rw                  usd                  13000       ae                  rwf                  8880       ae                  usd                  0

src table

    | srccountry code | srccurrency code | totalsrcamount |    ---------------------------------------------------------               ae                 usd              7               rw                 rwf             10               ae                 aed             399               ae                 usd              0

i want output - 

 | mapping | srcamount| destamount | currency |  -----------------------------------------------     abc-bcd      7         0         usd     bcd-abc     10        13000      rwf     abc-bcd     399       8880       aed     bcd-abc      0        3600       usd

each country mapping should have individual incoming , outgoing currencies. ex - when talking abc-bcd, srcamount refers amount in abc src going bcd particular currency. destamount refers amount coming in abc bcd (again particular currency).


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