SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM users;
SELECT CONCAT(city, ', ', state) AS location FROM customers;This method is a built-in function of the PHP PDO (PHP Data Objects) library, which is a database abstraction layer for accessing databases. It allows developers to write database-independent code and makes it easier to switch between different database software. The PDO library comes pre-installed with PHP, and it supports multiple database drivers like MySQL, PostgreSQL, SQLite, and more.