586. Customer Placing the Largest Number of Orders
Description
Table: Orders
+++  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.
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.
Example 1:
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?
Solutions
Solution 1: Group By + Sorting
We can use GROUP BY
to group the data by customer_number
, and then sort the groups in descending order by count(1)
. Finally, we can take the customer_number
of the first record as the result.
SQL Code


Solution 2
SQL Code

