PostgreSQL – SELECT Statement
The SELECT statement is a fundamental SQL statement used in PostgreSQL (and other relational database systems) to retrieve data from a database table. It allows you to query and retrieve specific columns and rows of data based on your criteria.
The basic syntax of a SELECT statement in PostgreSQL is as follows:
SELECT column1, column2, ... FROM table_name WHERE condition;Here’s a breakdown of the components:
SELECT: The keyword indicating that you want to retrieve data.column1, column2, ...: The columns you want to retrieve data from.FROM table_name: The table from which you want to retrieve data.WHERE condition: An optional condition that filters the rows based on specified criteria.
For example, let’s say you have a table named employees with columns employee_id, first_name, last_name, and salary. You might write a SELECT statement to retrieve the first and last names of employees whose salary is above a certain threshold:
SELECT first_name, last_name FROM employees WHERE salary > 50000;