I found this book quite good, the flow of the topics is good, snapshots fine and easy to pick up what I can say that at one point in your life you will touch upon Oracle unless you change your career !!!. Therefore it's one of them that you should have if your moving towards (Oracle) SQL.
If your serious into Oracle then it would serve you as a good reference.
The only snag that I have is the CD does not work although I got it working later on as follows: Copy all the files over to a temp drive. The file that can not be copied, create a file of the same name and of type in the temp directory. Run setup again and it should work.