Question

Jenna is working on a database that stores a company's invoices. The database includes a Table called Invoices, which has a column called outBalances that shows all outstanding balances. Jenna's boss has asked her to design a query that calculates the numerical mean of all outstanding balances. Which function should Jenna use on the outBalances column to help her complete this task?

Answer 1

Jenna should use the AVG function to calculate the mean of all outstanding balances in the Invoices table.This query will return the numerical mean of all outstanding balances from the Invoices table.

Step-by-step explanation:

Jenna should use the AVG function on the outBalances column to calculate the numerical mean of all outstanding balances in the Invoices table. The AVG function is designed to return the average value of a numeric column. The SQL query that Jenna needs to write would look something like this: SELECT AVG(outBalances) FROM Invoices;. This query will compute the mean by adding up all the outstanding balances and dividing by the count of rows with a non-NULL value in the outBalances column.

To calculate the numerical mean of all outstanding balances in the Invoices table, Jenna should use the AVG function on the outBalances column. The AVG function is a database function that calculates the average of a set of values. In this case, it will calculate the average of the outstanding balances.

Here's an example query that Jenna can use:

SELECT AVG(outBalances) AS MeanOutBalance FROM Invoices;

This query will return the numerical mean of all outstanding balances from the Invoices table.