SQL Exercise: Find largest number of orders booked by the customer
SQL Formatting Output: Exercise-9 with Solution
From the following table, write a SQL query that counts the unique orders and the highest purchase amount for each customer. Sort the result-set in descending order on 2nd field. Return customer ID, number of distinct orders and highest purchase amount by each customer.
Sample table: orders
SELECT customer_id, COUNT(DISTINCT ord_no), MAX(purch_amt) FROM orders GROUP BY customer_id ORDER BY 2 DESC;
Output of the Query:
customer_id count max 3002 3 5760.00 3009 2 2480.40 3005 2 948.50 3004 1 1983.43 3001 1 270.65 3007 1 2400.60 3008 1 250.45 3003 1 75.29
Relational Algebra Expression:
Relational Algebra Tree:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous SQL Exercise: Display customer name, city and grade by highest grade.
Next SQL Exercise: Purchase amount and commission for the last order.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
SQL: Tips of the Day
MySQL Like multiple values
The (a,b,c) list only works with in. For like, you have to use or:
WHERE interests LIKE '%sports%' OR interests LIKE '%pub%'
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises