Use the SQL CREATE TRIGGER statement to create a trigger. This is the syntax for the CREATE TRIGGER statement:

CREATE TRIGGER [owner_name.]trigname{ BEFORE | AFTER }{ INSERT | DELETE | UPDATE [ OF (column_name[ , ...])]}  ON table_name[ REFERENCING { OLDROW [ ,NEWROW ]| NEWROW [ ,OLDROW ]}][ FOR EACH { ROW | STATEMENT }][ IMPORT  
      java_import_clause]    BEGIN
          java_snippet    END