task: #586 & fix linter

.sqlfluff

@@ -1,7 +1,6 @@
 [sqlfluff]
 dialect = postgres
-exclude_rules = LT01, LT05, CP02
+exclude_rules = LT01, LT05, CP02, CV04
 
 [sqlfluff:rules]
 keywords_capitalisation_policy = upper
-max_line_length = 120

README.md

@@ -39,6 +39,7 @@ Have a good contributing!
     - [183. Customers Who Never Order](./leetcode/easy/183.%20Customers%20Who%20Never%20Order.sql)
     - [511. Game Play Analysis 1](./leetcode/easy/511.%20Game%20Play%20Analysis%201.sql)
     - [577. Employee Bonus](./leetcode/easy/577.%20Employee%20Bonus.sql)
+    - [586. Customer Placing the Largest Number of Orders](./leetcode/easy/586.%20Customer%20Placing%20the%20Largest%20Number%20of%20Orders.sql)
     - [595. Big Countries](./leetcode/easy/595.%20Big%20Countries.sql)
 2. [Medium](./leetcode/medium/)
     - [176. Second Highest Salary](./leetcode/medium/176.%20Second%20Highest%20Salary.sql)

leetcode/easy/586. Customer Placing the Largest Number of Orders.sql

@@ -0,0 +1,26 @@
+/*
+Question 586. Customer Placing the Largest Number of Orders
+Link: https://leetcode.com/problems/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.
+*/
+
+SELECT customer_number
+FROM Orders
+GROUP BY customer_number
+ORDER BY COUNT(1) DESC
+LIMIT 1