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  • Book Overview & Buying Learning PostgreSQL 10
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Learning PostgreSQL 10

Learning PostgreSQL 10 - Second Edition

By : Salahaldin Juba, Isabel Maria Duarte Rosa, Andrey Volkov, Sheldon Strauch
2.3 (6)
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Learning PostgreSQL 10

Learning PostgreSQL 10

2.3 (6)
By: Salahaldin Juba, Isabel Maria Duarte Rosa, Andrey Volkov, Sheldon Strauch

Overview of this book

PostgreSQL is one of the most popular open source databases in the world, supporting the most advanced features included in SQL standards. This book will familiarize you with the latest features released in PostgreSQL 10. We’ll start with a thorough introduction to PostgreSQL and the new features introduced in PostgreSQL 10. We’ll cover the Data Definition Language (DDL) with an emphasis on PostgreSQL, and the common DDL commands supported by ANSI SQL. You’ll learn to create tables, define integrity constraints, build indexes, and set up views and other schema objects. Moving on, we’ll cover the concepts of Data Manipulation Language (DML) and PostgreSQL server-side programming capabilities using PL/pgSQL. We’ll also explore the NoSQL capabilities of PostgreSQL and connect to your PostgreSQL database to manipulate data objects. By the end of this book, you’ll have a thorough understanding of the basics of PostgreSQL 10 and will have the necessary skills to build efficient database solutions.
Table of Contents (17 chapters)
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Function predefined variables


The PL/pgSQL functions have several special variables that are created automatically in the top-level block. For example, if the function returns a trigger, then several variables, such as NEW, OLD, and TG_OP, are created.

In addition to the trigger special values, there is a Boolean variable called FOUND. This is often used in combination with DML and PERFORM statements to conduct sanity checks. The value of the FOUND variable is affected by the SELECT, INSERT, UPDATE, DELETE, and PERFORM statements. These statements set FOUND to true if at least one row is selected, inserted, updated, or deleted.

The PERFORM statement is similar to the SELECT statement, but it discards the result of the query. Finally, the EXECUTE statement does not change the value of the FOUND variable. The following examples show how the FOUND variable is affected by the INSERT and PERFORM statements:

DO $$
BEGIN
  CREATE TABLE t1(f1 int);

  INSERT INTO t1 VALUES (1);
  RAISE NOTICE '%',...
CONTINUE READING
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Learning PostgreSQL 10
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