Answer / Yogesh Kumar Sagar

No, triggers cannot be created directly on views. A trigger is associated with a specific table or a specific event on the table, and since views are not physical tables, triggers cannot be associated with them.

write a pl/sql function if enter a value=0 then output value=1 and vise verse with out using if and case statements.

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4. Select sum(A.salary) +sum(B.salary) as TOT_SAL from ( select LEVEL emp_id,level*100 salary,case when mod (level,2)=0then 2 else null end dept_id from dual connect by level<6 )A right outer join (select level emp_id ,level*200 salary ,case when mod (level,3)=0 then 2 else null end dept_id from dual connect by level<6)B On A.dept_id=B.dept_id And A.emp_id=B.emp-id;

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