SQL: Introduction to Subqueries

SELECT column_1, ..., column_n
FROM Table_1
WHERE expression operator
(SELECT column_1, ..., column_n
FROM Table_2
WHERE condition)
SELECT client_id
FROM orders
WHERE orders.cost > 10000;
SELECT last_name, first_name, company
FROM clients
WHERE clients.id IN
(SELECT orders.client_id
FROM orders
WHERE orders.cost > 10000);

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