﻿ SQL: Customer with the highest purchase amount

# SQL Exercises: Customer with the highest purchase amount

## SQL Aggregate Functions: Exercise-17 with Solution

From the following table, write a SQL query to determine the maximum order (purchase) amount generated by each salesperson. Filter the rows for the salesperson ID is in the range 5003 and 5008 (Begin and end values are included.). Return salesperson id and maximum purchase amount.

Sample table: orders

Sample Solution:

``````SELECT salesman_id,MAX(purch_amt)
FROM orders
GROUP BY salesman_id
HAVING salesman_id BETWEEN 5003 AND 5008;
``````

Output of the Query:

```salesman_id	max
5005		270.65
5003		2480.40
5007		75.29
5006		1983.43
```

Code Explanation:

In the given SQL query, the salesman_id and the maximum purchase amount (purch_amt) will be retrieved from the 'orders' table for salesmen with an id between 5003 and 5008.
The result will show the maximum purchase amount made by each salesman in the specified range. The "HAVING" clause filters the result set by only showing salesmen whose id is between 5003 and 5008.
The result will show the maximum purchase amount made by each salesman, with the salesman_id being grouped together.

Explanation:

Visual presentation:

## Query Visualization:

Duration:

Rows:

Cost:

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Previous SQL Exercise: Customer details and purchases over a certain amount.
Next SQL Exercise: Count all orders for a specific date.

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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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