Following a few requests, here are some sites you may find useful for supporting your SQL learning:
General
http://www.stickyminds.com/
http://www.thefreecountry.com/documentation/onlinesql.shtml (free online tutorials)
T-SQL
http://sqlcourse.com/ (free online tutorial)
http://www.w3schools.com/sql/default.asp (free online tutorial)
http://sqlzoo.net/
http://www.sqlservercentral.com/
PL/SQL
http://www.orafusion.com/
http://ora-00937.ora-code.com/ (Oracle error codes)
Syntax differences between T-SQL and PL/SQL
http://www.dba-oracle.com/oracle_news/2005_12_16_sql_syntax_differences.htm
If I come across any others I'll add them
James
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