IGNOU BCSL 135 2026 2027 - Calculate the total service expenditure incurred by each customer.

Question

Calculate the total service expenditure incurred by each customer.

08 Aug 2026

Answer :

Word Count : 1170

In a service-oriented database system, calculating the total service expenditure incurred by each customer is a common DBMS operation. It involves storing customer details, recording the services used by each customer, maintaining the cost of every service, and then applying an aggregate function such as `SUM()` to calculate the total expenditure for each customer. In a DBMS and C++ Lab context, this problem demonstrates the practical use of tables, primary keys, foreign keys, joins, grouping, aggregate functions, and database connectivity. Suppose a database contains information about customers and the services they have availed. The customer table may contain fields such as `Customer_ID`, `Customer_Name`, `Address`, and `Phone`. Another table, such as `Service`, may contain `Service_ID`, `Service_Name`, and `Service_Cost`. A third table, `Customer_Service`, can record which customer has used which service and how many times. For example, the tables can be designed as follows: `Customer(Customer_ID, Customer_Name, Address, Phone)` `Service(Service_ID, Service_Name, Service_Cost)` `Customer_Service(Customer_ID, Service_ID, Quantity)` The `Customer_ID` field uniquely identifies each customer and acts as the primary key of the `Customer` table. Similarly, `Service_ID` is the primary key of the `Service` table. In the `Customer_Service` table, these fields act as foreign keys and establish relationships between customers and services. Consider the following sample data: Customer table: | Customer_ID | Customer_Name | | ----------- | ------------- | | 101 | Amit | | 102 | Ravi | | 103 | Neha | | 104 | Priya | Service table: | Service_ID | Service_Name | Service_Cost | | ---------- | ------------ | -----------: | | 1 | Internet | 500 | | 2 | Maintenance | 1000 | | 3 | Installation | 1500 | | 4 | Support | 300 | Customer_Service table: | Customer_ID | Service_ID | Quantity | | ----------- | ---------- | -------: | | 101 | 1 | 2 | | 101 | 4 | 3 | | 102 | 2 | 1 | | 102 | 3 | 2 | | 103 | 1 | 1 | | 103 | 2 | 2 | | 104 | 4 | 4 | The total expenditure of a customer can be calculated by multiplying the cost of each service by the quantity used and then adding all such amounts belonging to that customer. For Amit, the expenditure is: Internet = 2 × 500 = 1000 Support =

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