how to judge declare param is null on using trigger in Oracle10g? -


i have defined following trigger:

create or replace trigger  c_ins_task_insert    before insert        on c_ins_task   each row declare v_yearpaoidold varchar2(255); begin       select bsnum v_yearpaoidold t_ins_businessinfo bs   bs.pbsnum = :new.cbsnum , bs.permid = :new.permid , rownum =1;    if(v_yearpaoidold not null)     :new.bsnum := v_yearpaoidold;     :new.isstart := '1';     :new.isfinish := '6';     :new.starttime := systimestamp;    end if; end;

``` when execute code ,i error .and remove trigger, next picture good,so guess error in if(v_yearpaoidold not null) then,but don't know how it.

trigger

pl/sql


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