CREATE TRIGGER trigger-name trigger-time trigger-event [, trigger-event,...]
[ ORDER integer ] ON table-name
[ REFERENCING [ OLD AS old-name ]
                            [ NEW AS new-name ] ]
[ FOR EACH { ROW | STATEMENT } ]
[ WHEN ( search-condition ) ]

trigger-time : BEFORE | AFTER | RESOLVE
trigger-event :DELETE | INSERT | UPDATE | UPDATE OF column-list