25.4. SQL
We now provide an overview of SQL in the context of our books database. You will be able to use the SQL discussed here in the examples later in the chapter and in examples in Chapters 26–28.
The next several subsections discuss the SQL keywords listed in Fig. 25.10 in the context of SQL queries and statements. Other SQL keywords are beyond this text’s scope. To learn other keywords, refer to the SQL reference guide supplied by the vendor of the RDBMS you are using. [Note: For more information on SQL, refer to the web resources in Section 25.15 and the recommended readings listed at the end of this chapter.]
| SQL keyword | Description |
|---|---|
| SELECT | Retrieves data from one or more tables. |
| FROM | Tables involved in the ... |
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