ALL

Operator

Compares a value to all values returned by a subquery. Returns true only if all comparisons are true.

Syntax

WHERE col operator ALL (subquery)

Example

SELECT * FROM products
WHERE price > ALL (
  SELECT price FROM products WHERE category = 'budget'
);

About SQL ALL

The ALL keyword belongs to the Operator category of SQL statements. Compares a value to all values returned by a subquery. Returns true only if all comparisons are true. 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 ALL 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 ALL: 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

ANYEXISTSINNOT