Books for certification

[DesperateCoder]

Hello

I am going to study for database certification about SQL. I noticed that there are too many choices of books so can anyone recommend me good books.

I know database basics so now I need to study deeper.

Thank you for your answer.

[DesperateCoder]

Hello

Nobody get me good ideas. So I chose this book. I hope someone can tell me if it is useful or not when you practice for certification.