OR
OperatorCombines conditions — at least one condition must be true for a row to be included.
Syntax
WHERE condition1 OR condition2
Example
SELECT * FROM products WHERE category = 'shoes' OR category = 'boots';
About SQL OR
The OR keyword belongs to the Operator category of SQL statements. Combines conditions — at least one condition must be true for a row to be included. 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 OR 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 OR: 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.