Which of the three sliders to use?

AFAIK in PL/SQL, there are three ways to define a cursor:
1. explicit (with open, fetch and close)
2. with FOR clause
3. with FOR clause (using subqueries)
If there is no particular reasons for the use of one, you have some advice for me to use one over the other (run time, space in the memory,...) or that you usually use all these?
Thank you!

I can highly recommend studied (as opposed to just reading) this article written by Bryn Llewellyn (the guy who ' owns ' inside the Oracle PL/SQL):

http://www.Oracle.com/technology/tech/pl_sql/PDF/doing_sql_from_plsql.PDF

"Do SQL in PL/SQL.

Tags: Database

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