Skip to Content
PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

There's more…

Indexes that depend on a dropped column are automatically dropped as well. All other objects that depend on the column(s), such as foreign keys from other tables, will cause the ALTER TABLE statement to be rejected. You can override this and drop everything in sight using the CASCADE option, as follows:

ALTER TABLE x DROP COLUMN  last_update_timestampCASCADE;

Adding a column with a non-null default value can be done with ALTER TABLE … ADD COLUMN … DEFAULT …, as shown above, which however holds an AccessExclusive lock for the whole duration of the command, which is not short as 100% of the rows must be rewritten.

The script introduced in the recipe "Using psql variables" in this chapter is an example of how to do the same without ...

Become 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,
and much more.
Start your free trial

You might also like

PostgreSQL 13 Cookbook

PostgreSQL 13 Cookbook

Vallarapu Naga Avinash Kumar
PostgreSQL 9 Administration Cookbook - Second Edition

PostgreSQL 9 Administration Cookbook - Second Edition

Simon Riggs, GIANNI CIOLLI, Hannu Krosing, Gabriele Bartolini

Publisher Resources

ISBN: 9781788474924Supplemental Content