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  • Book Overview & Buying Learning PostgreSQL
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Learning PostgreSQL

Learning PostgreSQL

By : Salahaldin Juba, Achim Vannahme, Andrey Volkov
4.3 (6)
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Learning PostgreSQL

Learning PostgreSQL

4.3 (6)
By: Salahaldin Juba, Achim Vannahme, Andrey Volkov

Overview of this book

PostgreSQL is one of the most powerful and easy to use database management systems. It supports the most advanced features included in SQL standards. The book starts with the introduction of relational databases with PostegreSQL. It then moves on to covering data definition language (DDL) with emphasis on PostgreSQL and common DDL commands supported by ANSI SQL. You will then learn the data manipulation language (DML), and advanced topics like locking and multi version concurrency control (MVCC). This will give you a very robust background to tune and troubleshoot your application. The book then covers the implementation of data models in the database such as creating tables, setting up integrity constraints, building indexes, defining views and other schema objects. Next, it will give you an overview about the NoSQL capabilities of PostgreSQL along with Hstore, XML, Json and arrays. Finally by the end of the book, you'll learn to use the JDBC driver and manipulate data objects in the Hibernate framework.
Table of Contents (16 chapters)
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15
Index

Querying the data with the SELECT statement


SELECT statements or SELECT queries or just queries are used to retrieve data from the database. SELECT queries can have different sources: tables, views, functions or the VALUES command. All of them are relations or can be treated as relations or return relations, which functions can do. The output of SELECT is also a relation which in general can have multiple columns and contain many rows. Since the result and the source of the query have the same nature in SQL, it is possible to use one SELECT query as a source for another statement. But in this case, both queries are considered as parts of one bigger query. The source of the data, output format, filters, grouping, ordering and required transformations of the data are specified in the code of the query.

In general, SELECT queries do not change the data in the database and could be considered as read-only, but there is an exception. If a volatile function is used in the query, then the data...

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Learning PostgreSQL
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