Although I barely write about SQL on this blog, Stephanie from the WhoIsHostingThis company draws my attention to a post where she offers a bunch of useful resources about SQL.
Have a look especially to the ‘SQL Language Reference’ and ‘Tutorials’ sections which are fundamentals to deal with databases management.
Br writing this, it reminds me that some month ago I gave a link to comparison between RDBMS and NoSQL. There is a scheme that worth reading it.
Aside, I’ve read an interesting benchmark with advantages and drawbacks of the two main current databases management systems: “relational” (RDBMS) and “NoSQL“.