PostgreSQL

Table of Contents

4.1. Lexical Structure

4.1.1. Identifiers and Key Words

4.1.2. Constants

4.1.3. Operators

4.1.4. Special Characters

4.1.5. Comments

4.1.6. Operator Precedence

4.2. Value Expressions

4.2.1. Column References

4.2.2. Positional Parameters

4.2.3. Subscripts

4.2.4. Field Selection

4.2.5. Operator Invocations

4.2.6. Function Calls

4.2.7. Aggregate Expressions

4.2.8. Window Function Calls

4.2.9. Type Casts

4.2.10. Collation Expressions

4.2.11. Scalar Subqueries

4.2.12. Array Constructors

4.2.13. Row Constructors

4.2.14. Expression Evaluation Rules

4.3. Calling Functions

4.3.1. Using Positional Notation

4.3.2. Using Named Notation

4.3.3. Using Mixed Notation

This chapter describes the syntax of SQL. It forms the foundation for understanding the following chapters which will go into detail about how SQL commands are applied to define and modify data.

We also advise users who are already familiar with SQL to read this chapter carefully because it contains several rules and concepts that are implemented inconsistently among SQL databases or that are specific to PostgreSQL.

If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.

Privacy Policy | Code of Conduct | About PostgreSQL | Contact

Copyright © 1996-2023 The PostgreSQL Global Development Group