SQL commandline commands,SQL help,practise paper, edit previous queries

1>SQL command line commands:
Friends while practising in lab i have come across some SQL commands like save ,clr scr, sho user from my friends can anybody tell me or give the list of this commands


2>Help in SQL like Unix:
Dont we have anything like $man command in unix for SQL also.

3>Practise paper:
I have completed my SQL basic course and i want to be thorough with queries, so i want some practise paper suggest me a website or mail me some practise paper to [email protected] i will b thankfull for it.

4>Trace previously entered query:
In unix we use up arrow key to track previously entered command the same we cannot do in SQL, is there any way to edit previously entered few queries

Please don't confuse SQL (a query language) and SQL*Plus (a tool).

1> See the SQL*Plus manual: http://download.oracle.com/docs/cd/B...b14357/toc.htm

2> No, we don't. See http://download.oracle.com/docs/cd/B...b14200/toc.htm

3> Tons of stuff on the net, just try to search it.

4> Install rlwrap: http://www.oracle-base.com/articles/linux/rlwrap.php