November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 4. PostgreSQL Advanced Building Blocks
In this chapter, the rest of the PostgreSQL building blocks, including views, indexes, functions, triggers, and rules, will be introduced. In addition to that, the web car portal schema will be revised. Several DDL commands, such as CREATE and ALTER, will also be introduced.
Since the lexical structure and several DML commands have not been introduced as yet, we will try to use very simple DML commands.
Views
A view can be seen as a named query, or as a wrapper around a SELECT statement. Views are essential building blocks of relational databases from the UML modeling perspective; a view can be thought of as a method for a UML class. Views share several advantages over procedures, so the following benefits ...
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