SQL Interview Question || Identifying Customers Who Ordered Multiple Distinct Product
In today’s video, I’ll walk you through an intermediate-level SQL interview question that tests your skills in working with GROUP BY, HAVING, and DISTINCT clauses. We’ll dive into a practical example where you learn how to query for customers who have ordered more than one distinct product.
📝 Here’s what you’ll learn:
Understanding how to group data effectively using GROUP BY.
Using HAVING to filter grouped data.
Applying DISTINCT to count unique values.
Writing clean and optimized SQL queries.
💻 Table Schema:
CREATE TABLE orders_tab (
order_id INT PRIMARY KEY, customer_id INT,
product_id INT, quantity INT,
order_date DATE);
INSERT INTO orders_tab (order_id, customer_id, product_id, quantity, order_date)
VALUES(1, 101, 201, 2, '2024-08-01'),
(2, 101, 202, 1, '2024-08-05'),
(3, 102, 203, 1, '2024-08-03'),
(4, 103, 201, 1, '2024-08-02'),
(5, 103, 201, 1, '2024-08-06');
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