Use the database table below to answer the following questions. 
-What is referential integrity? What happens when a database does not have or enforce referential integrity?
Definitions:
Contribution Margin Ratio
The contribution margin ratio measures the percentage of sales revenue remaining after covering variable costs, contributing to covering fixed costs and generating profit.
Net Operating Income
A metric that calculates a company's profit after subtracting operating expenses but before interest and taxes are deducted.
Unit Variable Cost
The cost of producing one unit of a product or service which varies with the level of production or sales.
Monthly Sales
The total value or volume of sales transactions that a business completes within a single month, often used to assess performance trends.
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