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PostgreSQL 9.1.14 Documentation

The PostgreSQL Global Development Group


Table of Contents
Preface
What is PostgreSQL?
A Brief History of PostgreSQL
Conventions
Further Information
Bug Reporting Guidelines
I. Tutorial
1. Getting Started
2. The SQL Language
3. Advanced Features
II. The SQL Language
4. SQL Syntax
5. Data Definition
6. Data Manipulation
7. Queries
8. Data Types
9. Functions and Operators
10. Type Conversion
11. Indexes
12. Full Text Search
13. Concurrency Control
14. Performance Tips
III. Server Administration
15. Installation from Source Code
16. Installation from Source Code on Windows
17. Server Setup and Operation
18. Server Configuration
19. Client Authentication
20. Database Roles
21. Managing Databases
22. Localization
23. Routine Database Maintenance Tasks
24. Backup and Restore
25. High Availability, Load Balancing, and Replication
26. Recovery Configuration
27. Monitoring Database Activity
28. Monitoring Disk Usage
29. Reliability and the Write-Ahead Log
30. Regression Tests
IV. Client Interfaces
31. libpq - C Library
32. Large Objects
33. ECPG - Embedded SQL in C
34. The Information Schema
V. Server Programming
35. Extending SQL
36. Triggers
37. The Rule System
38. Procedural Languages
39. PL/pgSQL - SQL Procedural Language
40. PL/Tcl - Tcl Procedural Language
41. PL/Perl - Perl Procedural Language
42. PL/Python - Python Procedural Language
43. Server Programming Interface
VI. Reference
I. SQL Commands
II. PostgreSQL Client Applications
III. PostgreSQL Server Applications
VII. Internals
44. Overview of PostgreSQL Internals
45. System Catalogs
46. Frontend/Backend Protocol
47. PostgreSQL Coding Conventions
48. Native Language Support
49. Writing A Procedural Language Handler
50. Writing A Foreign Data Wrapper
51. Genetic Query Optimizer
52. Index Access Method Interface Definition
53. GiST Indexes
54. GIN Indexes
55. Database Physical Storage
56. BKI Backend Interface
57. How the Planner Uses Statistics
VIII. Appendixes
A. PostgreSQL Error Codes
B. Date/Time Support
C. SQL Key Words
D. SQL Conformance
E. Release Notes
F. Additional Supplied Modules
G. External Projects
H. The Source Code Repository
I. Documentation
J. Acronyms
Bibliography
Index

Comments


Alex Prichard
Sept. 4, 2012, 4:33 p.m.

For the documentation for substring/substr it would be useful to note the behaviour where there is no meaningful result.

For example, columnA = 'test'

select substring(columnA from 6 for 2) ...

result is '' rather than null.

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