--
      
      
         Create sequence 
      
      
        create
      
      
         sequence SEQ_PUSH

minvalue 
      
      
        1
      
      
        

maxvalue 
      
      
        9999999999
      
      
        

start 
      
      
        with
      
      
        1
      
      
        

increment 
      
      
        by
      
      
        1
      
      
        

cache 
      
      
        20
      
      ;
    

      
        create
      
      
        or
      
      
        replace
      
      
        trigger
      
      
         tr_id_insert

  before 
      
      
        insert
      
      
        on
      
      
         t_push  

  
      
      
        for
      
      
         each row


      
      
        declare
      
      
        --
      
      
         local variables here
      
      
        begin
      
      
        select
      
       seq_user_id.nextval 
      
        into
      
       :new.id 
      
        from
      
      
         dual;


      
      
        end
      
       tr_id_insert;