LeetCode 586: Customer Placing the Largest Number of Orders Solution
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586. Customer Placing the Largest Number of Orders
Problem Explanation
Explanation
To find the customer who has placed the largest number of orders, we can use a SQL query that groups the orders by customer_number and counts the number of orders for each customer. We then order the result in descending order based on the count and select the customer_number with the highest count.
If there are multiple customers with the same largest number of orders, we can modify the query to include all such customers.
Algorithm:
- Group the orders by customer_number and count the number of orders for each customer.
- Order the result in descending order based on the count.
- Select the customer_number with the highest count.
Time complexity: O(NlogN) - where N is the number of orders Space complexity: O(1)
Solution Code
# Write your Java solution here
SELECT customer_number
FROM Orders
GROUP BY customer_number
ORDER BY COUNT(order_number) DESC
LIMIT 1;Try It Yourself
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