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SQL Exercises: Find the highest purchase amount ordered by the each customer

SQL Aggregate Functions: Exercise-9 with Solution

From the following table, write a SQL query to find the highest purchase amount ordered by each customer. Return customer ID, maximum purchase amount.

Sample table: orders


Sample Solution:

SELECT customer_id,MAX(purch_amt) 
FROM orders 
GROUP BY customer_id;

Output of the Query:

customer_id	max
3007		2400.60
3008		250.45
3002		5760.00
3001		270.65
3009		2480.40
3004		1983.43
3003		75.29
3005		948.50

Relational Algebra Expression:

Relational Algebra Expression: Find the highest purchase amount ordered by the each customer.

Relational Algebra Tree:

Relational Algebra Tree: Find the highest purchase amount ordered by the each customer.

Explanation:

Syntax of find the highest purchase amount ordered by the each customer

Pictorial presentation:

Find the highest purchase amount ordered by the each customer

Practice Online


Query Visualization:

Duration:

Query visualization of Find the highest purchase amount ordered by the each customer - Duration

Rows:

Query visualization of Find the highest purchase amount ordered by the each customer - Rows

Cost:

Query visualization of Find the highest purchase amount ordered by the each customer - Cost

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Previous: From the following table, write a SQL query to find the highest grade of the customers for each of the city. Return city, maximum grade.
Next: From the following table, write a SQL query to find the highest purchase amount ordered by each customer on a particular date. Return, order date and highest purchase amount.

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SQL: Tips of the Day

SQL Server SELECT into existing table. 

INSERT INTO dbo.TABLETWO
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

This assumes there's only two columns in dbo.TABLETWO - you need to specify the columns otherwise:

INSERT INTO dbo.TABLETWO
  (col1, col2)
SELECT col1, col2
  FROM dbo.TABLEONE
 WHERE col3 LIKE @search_key

Database: SQL Server

Ref: https://bit.ly/3y6tpA3