This will run only the SQL that your cursor is on. You do not need to highlight the line or the entire SQL statement; simply place your cursor anywhere inside the SQL statement and click SHIFT-F9.
This will verify (parse) the statement without executing it.
This will execute an explain plan on the current statement.
This will bring up your previous SQL statement. If you use SHIFT-F9 and are disciplined about keeping all iterations of executed statements in the screen…