The data on this sales invoice would be generated from how many well-structured tables in a well-designed relational database? 
Definitions:
Federal Laws
Laws passed by the national government of a country that are applicable throughout its entire territory.
Discriminate Hiring
The practice of unfairly treating individuals differently in hiring based on characteristics such as race, gender, age, or religion, often leading to biased or unjust outcomes.
Job Stress
The harmful physical and emotional responses that occur when the requirements of a job do not match the capabilities, resources, or needs of the worker.
Isolation
The experience of being separated from others, which can be physical or emotional, leading to feelings of loneliness.
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