UPDATE statement with multiple joins in PostgreSQL

Question

I\'m trying to update a table called incode_warrants and set the warn_docket_no to the viol_docket_no from the incode_violations

Answer 1

UPDATE incode_warrants iw
     SET warn_docket_no = iv.viol_docket_no
FROM incode_warrantvs AS iwvs, incode_violations AS iv 
WHERE iv.viol_citation_no = iwvs.warnv_citation_no AND
      iv.viol_viol_no = iwvs.warnv_viol_no AND
      iw.warn_rid = iwvs.warnv_rid;