What I’m reading is (Introduction to Database Systems) (Author: Sa Shixuan) There are so many chapters in it, do you want to read them all? Also, those chapters are more important
Judging from the name of this book, if you are not a DBA, you basically don’t need to read this book.
Practical programmers can just look at the basic dml operations of the database, functions, stored procedures, cursors, triggers and other commonly used ones
Database Books Online, msdn technical resource library (sql section)