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PostgreSQL 11 Server Side Programming Quick Start Guide

You're reading from   PostgreSQL 11 Server Side Programming Quick Start Guide Effective database programming and interaction

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Product type Paperback
Published in Nov 2018
Publisher
ISBN-13 9781789342222
Length 260 pages
Edition 1st Edition
Languages
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Author (1):
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Luca Ferrari Luca Ferrari
Author Profile Icon Luca Ferrari
Luca Ferrari
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Table of Contents (12) Chapters Close

An introduction to PL/pgSQL

PL/pgSQL is an imperative SQL-like language that offers several features to write a piece of runnable code. Besides SQL, this is the default language used in PostgreSQL to write functions, procedures, triggers, and programs in general.

PostgreSQL has a special statement called DO that accepts a PL/pgSQL piece of code and executes it as an anonymous code block. This is particularly handy to learn features of the language or to execute a code snippet without having to wrap it into a function or a routine. The syntax of the DO statement is quite straightforward and only requires us to specify the block of code to execute:

DO <plpgsql code block>;

In the rest of the chapter, the DO statement will be used to run PL/pgSQL pieces of code and demonstrate all the main features of the language.

A runnable PL/pgSQL piece of code must contain at least one...

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