SQL Exercises: Find the total purchase amount for all orders

SQL Aggregate Functions: Exercise-1 with Solution

From the following table, write a SQL query to calculate total purchase amount of all orders. Return total purchase amount.

Sample table: orders

Sample Solution:

SELECT SUM (purch_amt) 
FROM orders;

Output of the Query:

sum
17541.18

Code Explanation:

The said query in SQL retrieve the sum of values in the "purch_amt" column from the 'orders' table.
The "SELECT SUM (purch_amt)" statement specifies that the sum of the values in the "purch_amt" column should be retrieved. The result of this query will be a single value that represents the sum of all values in the "purch_amt" column in the 'orders' table.

Relational Algebra Expression:

Relational Algebra Tree:

Explanation:

Visual presentation:

Practice Online

Query Visualization:

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