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PostgreSQL 9.6.24 Documentation
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Chapter 41. PL/pgSQL - SQL Procedural Language

Table of Contents

41.1. Overview

41.1.1. Advantages of Using PL/pgSQL
41.1.2. Supported Argument and Result Data Types

41.2. Structure of PL/pgSQL

41.3. Declarations

41.3.1. Declaring Function Parameters
41.3.2. ALIAS
41.3.3. Copying Types
41.3.4. Row Types
41.3.5. Record Types
41.3.6. Collation of PL/pgSQL Variables

41.4. Expressions

41.5. Basic Statements

41.5.1. Assignment
41.5.2. Executing a Command With No Result
41.5.3. Executing a Query with a Single-row Result
41.5.4. Executing Dynamic Commands
41.5.5. Obtaining the Result Status
41.5.6. Doing Nothing At All

41.6. Control Structures

41.6.1. Returning From a Function
41.6.2. Conditionals
41.6.3. Simple Loops
41.6.4. Looping Through Query Results
41.6.5. Looping Through Arrays
41.6.6. Trapping Errors
41.6.7. Obtaining Execution Location Information

41.7. Cursors

41.7.1. Declaring Cursor Variables
41.7.2. Opening Cursors
41.7.3. Using Cursors
41.7.4. Looping Through a Cursor's Result

41.8. Errors and Messages

41.8.1. Reporting Errors and Messages
41.8.2. Checking Assertions

41.9. Trigger Procedures

41.9.1. Triggers on Data Changes
41.9.2. Triggers on Events

41.10. PL/pgSQL Under the Hood

41.10.1. Variable Substitution
41.10.2. Plan Caching

41.11. Tips for Developing in PL/pgSQL

41.11.1. Handling of Quotation Marks
41.11.2. Additional Compile-time Checks

41.12. Porting from Oracle PL/SQL

41.12.1. Porting Examples
41.12.2. Other Things to Watch For
41.12.3. Appendix

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