Since I'm over 30, and "learned me some SQL" from someone over 30, I guess you should disregard anything I have to say on this, but here goes:
Spend time on this and other SQL web pages.
Go to a bookstore with a list of specific SQL questions, check as many books as you can for answers to those questions. You'll probably find one that answers the most, and that you can understand the answers. For me, that was SQL Server 2000 Bible, by Paul Neilsen. (Get the 2005 version of the book, of course.)
Do searches in Books Online when you have questions.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon