Quick Reference
The EXISTS keyword tests for the existence of any record in a subquery, and returns “true” if the subquery returns one or more records.
The following lists the suppliers with a product price less than 50.
SELECT order_number
FROM Orders
WHERE EXISTS (SELECT product_name FROM Products WHERE order_id = order_number.order_id AND price < 50);SQL Notes:
- Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
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