1、- 1 - Chapter fourChapter four This chapter is a complete introduction to SQL in general,and SQLites implementation of it in particular. It assumes no previous experience with either SQL or the relational model. If you are new to SQL, SQLite should serve as an excellent springboard to entering the w
2、orld of relational databases.It will give you a good grounding in the fundamentals.While the previous chapter on the relational model was a little theoretical and stuffy, this chapter is much more relaxed and practical. Were not here to prove theories; were here to get things done. So if you didnt r
3、ead the previous chapter, thats perfectly fine. You should still have no trouble with the material covered in this chapter. An understanding of the relational model is edifying, but not necessary to learn SQL. SQL is the sole (and almost universal) means by which to communicate with a relational dat
4、abase. It is a language exclusively devoted to information processing. It is designed for structuring, reading, writing, sorting, filtering, protecting, calculating, generating, grouping, aggregating, and in general managing information.SQL is an intuitive, user-friendly language. It can be fun to use and is quite powerful. One of the fun things about SQL is that regardless of whether you are an expert or a novice, it seems that you can always continue to learn new ways of doing things (fo
