PostgreSQL SQL Reference

This section provides a comprehensive reference for the SQL commands and functions supported by PostgreSQL. Whether you are a beginner or an experienced user, this guide will help you understand how to effectively use SQL with PostgreSQL.

Common SQL Commands

SELECT: Retrieve data from a database.
INSERT: Add new data into a database.
UPDATE: Modify existing data in a database.
DELETE: Remove data from a database.
CREATE: Define a new database object, such as a table or view.
DROP: Remove a database object.

Functions

COUNT(): Returns the number of rows that match a specified criterion.
SUM(): Calculates the total sum of a numeric column.
AVG(): Calculates the average value of a numeric column.
MAX(): Returns the maximum value in a column.
MIN(): Returns the minimum value in a column.

Example

To retrieve all columns from a table named "users", you would use the following SQL command:

SELECT * FROM users;

For more information on SQL commands and functions in PostgreSQL, please visit our SQL Reference Guide.