Learning SQL

I have been a DBA for about a year now and I still have not had to really do much SQL. I do other things such as backups, restores, indexing, and other things to make sure that our databases are in good shape and that our data is safe. I thought it would be a great idea to learn some SQL though so when a developer complains about a query running slow I can take a look at the query and understand what it is doing and perhaps help them re-write the query so that it will preform better. I installed the AdventureWorks DB on my SQL Server Express instance that is running on my Desktop and I printed out a diagram of the database. I found a good site http://w3schools.com/ that has tutorials for many different proggraming languages and I have been working down the SQL Tutorial. I would not claim to be a developer but I have learned a lot and would recommend this to others that are trying to learn SQL.