SQL · Question 26 · Medium

SQL question 26

Table Orders:
order_id | customer | city | amount
101 | Meera | Chennai | 1200
102 | Arjun | Bengaluru | 600
103 | Meera | Chennai | NULL
104 | Sana | Delhi | 1100
105 | Arjun | Bengaluru | 600
106 | Dev | Bhopal | 300
107 | Sana | Delhi | 400

Table Customers:
name | tier
Meera | Gold
Arjun | Silver
Sana | Gold
Kabir | Silver

What does this query return?

SELECT COUNT(*)
FROM Orders
WHERE customer IN (SELECT name FROM Customers
                   WHERE tier = 'Gold');
  1. 2
  2. 4
  3. 3
  4. 5
Answer and explanation

Answer: B. 4

Explanation: The subquery returns the Gold customers Meera and Sana. Meera has orders 101 and 103, and Sana has 104 and 107, so 4 orders qualify. The NULL amount does not matter because only customer is tested.

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