Betinget WHERE-klausul med CASE-sætning i Oracle

Du kan skrive hvor klausul som:

where (case when (:stateCode = '') then (1)
            when (:stateCode != '') and (vw.state_cd in (:stateCode)) then 1
            else 0)
       end) = 1;

Alternativt kan du fjerne sagen helt:

where (:stateCode = '') or
      ((:stateCode != '') and vw.state_cd in (:stateCode));

Eller endnu bedre:

where (:stateCode = '') or vw.state_cd in (:stateCode)