Klausa WHERE bersyarat dengan pernyataan CASE di Oracle

Anda dapat menulis where klausa sebagai:

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

Atau, hapus case seluruhnya:

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

Atau, bahkan lebih baik:

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