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create or replace trigger update_manager1
before update of sal on emp FOR EACH ROW when (old.job='MANAGER')
declare
avg1 number(7,2);
begin
select avg(sal) into avg1 from empbackup where deptno=:old.deptno ;
if :new.sal> 3*avg1 then
new.sal=3*avg1
end if;
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