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Mastering PostgreSQL 15

You're reading from   Mastering PostgreSQL 15 Advanced techniques to build and manage scalable, reliable, and fault-tolerant database applications

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Product type Paperback
Published in Jan 2023
Publisher Packt
ISBN-13 9781803248349
Length 522 pages
Edition 5th Edition
Languages
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Author (1):
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Hans-Jürgen Schönig Hans-Jürgen Schönig
Author Profile Icon Hans-Jürgen Schönig
Hans-Jürgen Schönig
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Table of Contents (16) Chapters Close

Preface 1. Chapter 1: PostgreSQL 15 Overview 2. Chapter 2: Understanding Transactions and Locking FREE CHAPTER 3. Chapter 3: Making Use of Indexes 4. Chapter 4: Handling Advanced SQL 5. Chapter 5: Log Files and System Statistics 6. Chapter 6: Optimizing Queries for Good Performance 7. Chapter 7: Writing Stored Procedures 8. Chapter 8: Managing PostgreSQL Security 9. Chapter 9: Handling Backup and Recovery 10. Chapter 10: Making Sense of Backups and Replication 11. Chapter 11: Deciding on Useful Extensions 12. Chapter 12: Troubleshooting PostgreSQL 13. Chapter 13: Migrating to PostgreSQL 14. Index 15. Other Books You May Enjoy

Reassigning objects and dropping users

After assigning permissions and restricting access on various levels, it can happen that users are dropped from the system. Unsurprisingly, the commands to do this are the DROP ROLE and DROP USER commands. Here is the syntax of DROP ROLE:

test=# \h DROP ROLE
Command: DROP ROLE
Description: remove a database role
Syntax:
 DROP ROLE [ IF EXISTS ] name [, ...]
 URL: https://www.postgresql.org/docs/14/sql-droprole.html

Once the syntax of DROP ROLE has been discussed, we can give it a try. The following listing shows how this works:

test=# DROP ROLE joe;
ERROR:  role  "joe"  cannot be dropped because some  objects depend on it
DETAIL:  target of policy joe_pol_3 on table t_person
target of policy joe_pol_2 on table t_person
target of policy joe_pol_1 on table t_person
privileges for table t_person
owner of table t_user
owner of sequence t_user_id_seq
owner of default privileges on...
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