I use SQL every day, so I am fairly well-versed in it.

Even at that, I still enjoyed this book.

I didn't learn too much new, but found a few cool shortcuts and ideas.

Would recommend if learning SQL

It's fine as a reference guide or for understanding specific commands/syntax, but doesn't really allow you to practice. It's good for a surface level of knowledge but won't exactly turn you into an SQL developer, better to take a class or learn from someone who already knows. Has some good information on databases and how they work though.