Can any one recommend a book(s) or online for mysql and php

I have no interest in becoming an expert on them but as I am messing about with the cs-cart lark I sometimes come up against this dark area of knowledge which I would like to be able to see into a bit - even if just to put cs-cart into context.



For example people sometimes say “run this query”.



So allowing for the fact that it is only to bring some enlightenment and to sit with using cs-cart can anyone recommend a book or online resource that would fit the bill without being top heavy.

[URL]http://www.w3schools.com/sql[/URL]

[URL]http://www.w3schools.com/php[/URL]