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PostgreSQL 9 Administration Cookbook - Second Edition
book

PostgreSQL 9 Administration Cookbook - Second Edition

by Simon Riggs, GIANNI CIOLLI, Hannu Krosing, Gabriele Bartolini
April 2015
Intermediate to advanced content levelIntermediate to advanced
504 pages
11h 41m
English
Packt Publishing
Content preview from PostgreSQL 9 Administration Cookbook - Second Edition

Simplifying complex SQL queries

There are two types of complexity that you can encounter in SQL queries.

First, the complexity can be directly visible in the query, if it has hundreds or even thousands of rows of SQL code in a single query code. This can cause both maintenance headaches and slow execution.

The complexity can also be hidden in subviews, so the SQL code of the query may seem simple, but it uses other views and/or functions to do part of the work, which in turn can use others. This is much better for maintenance, but it can still cause performance problems.

Both the types of queries can either be written manually by programmers or data analysts, or can emerge as a result of a query generator.

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Publisher Resources

ISBN: 9781849519069Supplemental Content