LTRIM：http://msdn.microsoft.com/en-us/library/aa933237(v=sql.80).aspx
LEFT (Transact-SQL) http://msdn.microsoft.com/en-us/library/ms177601.aspx
RIGHT (Transact-SQL): http://msdn.microsoft.com/en-us/library/ms177532.aspx
CHARINDEX (Transact-SQL) http://msdn.microsoft.com/en-us/library/ms186323.aspx
Print @id
SQL STORE PROCEDURE: http://databases.about.com/od/sqlserver/a/storedprocedure.htm
SQL books: http://vyaskn.tripod.com/sqlbooks.htm