pls i need the basic difference between MySQL and SQL (i'm new in this field)

depends entirely on what version of MySQL you are using, or proposing to use, but this should point you in the right direction.

I still have a very good book form O'Reilly, I think its SQL in a Nutshell, but its quite old, and compares MySQL 3.22 with Oracle, SQL server & Postgres. If that books has been updated that might be a good starting point

In my view MySQL is pretty good on the SQL complinace side... it does miss soem of the more esoteric fnctions other db's have, but it has its own little wrinkles. It does have fewer legacy issues form what I've seen (ie we did this that way in 1991m therefore we must keep doing things that way in 2007

... porbmels wtih teh kyeborad aigan Healdem
... sounds like a homework assignment to me ...

Gr,
Yveau

actually, it sounds like another person trying to write queries that will work in more than one backend database system unchanged

if this is the case, oluwatomi, give up now, because this particular holy grail does not exist