Customer Placing the Largest Number of Orders - Practice Coding | SlaveCode
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586. Customer Placing the Largest Number of Orders
Easy
10 Points
Database
Table: Orders
Write a solution to find the customer_number for the customer who has placed the largest number of orders.
The test cases are generated so that exactly one customer will have placed more orders than any other customer.
The result format is in the following example.
Examples
Example 1
+-----------------+----------+
| Column Name | Type |
+-----------------+----------+
| order_number | int |
| customer_number | int |
+-----------------+----------+
order_number is the primary key (column with unique values) for this table.
This table contains information about the order ID and the customer ID.
Example 2
Input:
Orders table:
+--------------+-----------------+
| order_number | customer_number |
+--------------+-----------------+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 3 |
+--------------+-----------------+
Output:
+-----------------+
| customer_number |
+-----------------+
| 3 |
+-----------------+
Explanation:
The customer with number 3 has two orders, which is greater than either customer 1 or 2 because each of them only has one order.
So the result is customer_number 3.
Follow Up
What if more than one customer has the largest number of orders, can you find all the customer_number in this case?
586. Customer Placing the Largest Number of Orders
Easy
10 Points
Database
Table: Orders
Write a solution to find the customer_number for the customer who has placed the largest number of orders.
The test cases are generated so that exactly one customer will have placed more orders than any other customer.
The result format is in the following example.
Examples
Example 1
+-----------------+----------+
| Column Name | Type |
+-----------------+----------+
| order_number | int |
| customer_number | int |
+-----------------+----------+
order_number is the primary key (column with unique values) for this table.
This table contains information about the order ID and the customer ID.
Example 2
Input:
Orders table:
+--------------+-----------------+
| order_number | customer_number |
+--------------+-----------------+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 3 |
+--------------+-----------------+
Output:
+-----------------+
| customer_number |
+-----------------+
| 3 |
+-----------------+
Explanation:
The customer with number 3 has two orders, which is greater than either customer 1 or 2 because each of them only has one order.
So the result is customer_number 3.
Follow Up
What if more than one customer has the largest number of orders, can you find all the customer_number in this case?