SQL Exercises: Highest purchase amount from customers
SQL Aggregate Functions: Exercise-15 with Solution
From the following table, write a SQL query to determine the maximum order amount for each customer. The customer ID should be in the range 3002 and 3007(Begin and end values are included.). Return customer id and maximum purchase amount.
Sample table: orders
Sample Solution:
SELECT customer_id,MAX(purch_amt)
FROM orders
WHERE customer_id BETWEEN 3002 and 3007
GROUP BY customer_id;
Output of the Query:
customer_id max 3002 5760.00 3007 2400.60 3004 1983.43 3003 75.29 3005 948.50
Code Explanation:
The said SQL query retrieves the customer_id and maximum purchase amount (purch_amt) for customers with id between 3002 and 3007 from the 'orders' table. The result will show the maximum purchase amount made by each customer in the specified range, with the customer_id being grouped together.
Relational Algebra Expression:
Relational Algebra Tree:
Explanation :

Visual presentation:

Practice Online
Query Visualization:
Duration:

Rows:

Cost:

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Previous SQL Exercise: Higher purchase amount by the customer within a list.
Next SQL Exercise: Customer details and purchases over a certain amount.
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SQL: Tips of the Day
What is the best way to paginate results in SQL Server?
SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY OrderDate ) AS RowNum, * FROM Orders WHERE OrderDate >= '1980-01-01' ) AS RowConstrainedResult WHERE RowNum >= 1 AND RowNum < 20 ORDER BY RowNum
Database: SQL Server
Ref: https://bit.ly/3MGrNlk
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