The difference between all and any in sql

ALL and ANY in SQL compare the results of a subquery with the results of the main query. ALL requires the subquery to return true for every row, while ANY requires only that it return true for at least one row. Therefore, the ALL comparison is more strict and is typically used to determine if all conditions are met, while the ANY comparison is more relaxed and is used to determine if at least one condition is met.

The difference between ALL and ANY in SQL

Get straight to the point:

ALL and ANY in SQL are two different keywords used to compare the results of the subquery with the results of the main query.

Detailed answer:

1. ALL

ALL operator checks whether the subquery is valid for each row of the main query Returns true value. The ALL comparison returns true if the subquery returns true for all rows; otherwise, it returns false.

Example:

SELECT *
FROM customer
WHERE ALL (SELECT 1 FROM purchase WHERE customer_id = customer.id);

This query returns all customers, each of which made at least one purchase.

2. ANY

ANY operator checks whether the subquery returns true for any row of the main query. The ANY comparison returns true if the subquery returns a true value for at least one row; otherwise, it returns false.

Example:

SELECT *
FROM customer
WHERE ANY (SELECT 1 FROM purchase WHERE customer_id = customer.id);

This query returns all customers, at least one of whom made a purchase.

Summary:

Operator	Description
ALL	The subquery must return true for all rows
ANY	The subquery must return true for at least one row

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