INTERVIEW QUESTIONS ORACLE PL-SQL DETAILS

Question: How to avoid using cursors? What to use instead of cursor and in what cases to do so?

Answer: just use subquery in for clause

ex:

for emprec in (select * from emp)

loop

dbms_output.put_line(emprec.empno);

end loop;

no exit statement needed

implicit open,fetch,close occurs

just use subquery in for clause

ex:

for emprec in (select * from emp)

loop

dbms_output.put_line(emprec.empno);

end loop;

no exit statement needed

implicit open,fetch,close occurs

Source: CoolInterview.com

We have avoided declaration of cursor.the given example will create cursor with some system generated name. Source: CoolInterview.com

When the number of rows returned by query is small (around 100), then explicit cursor can be avoided safely since in those cases using explicit cursor is performance degrading(CPU overhead). Source: CoolInterview.com

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