PostgreSQL ALL Operator

ALL

The ALL operator:

• returns a Boolean value as a result
• returns TRUE if ALL of the sub query values meet the condition
• is used with SELECT, WHERE and HAVING statements

ALL means that the condition will be true only if the operation is true for all values in the range.

Example

List the products if ALL the records in the order_details with quantity larger than 10.

Note: This will of course return FALSE because the quantity column has many different values (not only the value of 10):

SELECT product_name
FROM products
WHERE product_id = ALL (
  SELECT product_id
  FROM order_details
  WHERE quantity > 10
);