Add a new calculated field name tuition in the first empty column to the right of the credits fields

Add a new calculated field name tuition in the first empty column to the right of the credits fields. The new field should calculate the value in the credits field multiplied by 150 ?run the query to view the results.

The correct answer and explanation is:

To add a calculated field named tuition in the first empty column to the right of the credits field and calculate its value as credits * 150, you can write an SQL query like this:

SQL Query

SELECT 
    *,
    (credits * 150) AS tuition
FROM 
    your_table_name;

Explanation

1. Understanding the Task:
   • The task is to create a new field (tuition) that dynamically calculates a value based on the credits field.
   • The calculation is defined as credits * 150. This means for each row in the database, the value in the credits column will be multiplied by 150, and the result will be stored in the new field.
2. SQL Query Breakdown:
   • SELECT *: Selects all existing columns from the table. This ensures that no data from the original table is omitted in the output.
   • (credits * 150) AS tuition: This expression calculates the tuition by multiplying the value in the credits column by 150. The AS tuition clause renames this calculated result as tuition for easier readability in the output.
   • FROM your_table_name: This specifies the table from which to fetch the data. Replace your_table_name with the actual name of your table.
3. Purpose of the Query:
   • The calculated field is not permanently added to the table but is generated dynamically for the query’s output. This approach avoids altering the table structure and provides flexibility.
   • The result can be used for reporting, visualization, or further processing.
4. Executing the Query:
   • Run this query in your database query tool (e.g., MySQL Workbench, SQL Server Management Studio, or pgAdmin) to see the results.
   • Ensure that the credits column contains numerical data, as multiplying non-numeric data will cause an error.
5. Output Example: Suppose the credits column contains values 10, 15, and 20. The output will look like this: credits tuition 10 1500 15 2250 20 3000

This dynamic calculation is useful for deriving insights without modifying the base data structure.