CONCAT

Function

Concatenates two or more strings into a single string.

Syntax

CONCAT(str1, str2, ...) | str1 || str2

Example

SELECT CONCAT(first_name, ' ', last_name) as full_name
FROM users;

SELECT 'Hello' || ' ' || 'World';

About SQL CONCAT

The CONCAT keyword belongs to the Function category of SQL statements. Concatenates two or more strings into a single string. Understanding this command is essential for any developer working with relational databases like PostgreSQL, MySQL, SQLite, or SQL Server.

SQL (Structured Query Language) is the standard language for managing and querying relational databases. The CONCAT statement is supported across all major database systems, though specific syntax may vary slightly between PostgreSQL, MySQL, MariaDB, Oracle, SQL Server, and SQLite. Always consult your database's documentation for vendor-specific features and limitations.

Best practices for using CONCAT: always test queries on a development database before running them in production, use parameterized queries to prevent SQL injection, and leverage EXPLAIN to understand query performance. For complex queries, consider using CTEs (Common Table Expressions) to improve readability and maintainability.

Related SQL Keywords

SUBSTRINGUPPERLOWERREPLACE