Here are the functional requirements for simple model of data base, make and descire DETAILED use case UML diagrams $,$with actor uses explanation,purpose and comments for the system requierments:

Functional Requirements:

Creating New Tables: The system should be able to create new tables.

SELECT Command: The system should be able to return a subset of the columns of a table.

Opening a Database Containing a List of Tables: The program should be able to open an existing database from a file.

Closing a Database Containing a List of Tables: The program should be able to close an existing database from a file.

Saving a Database: The system should be able to save the current state of a database to a file.

Displaying a Table: The system should be able to display the data in a table with paging capability.

Printing Tables: The system should be able to show all rows from a given table.

Updating Rows

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UPDATE

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: The system should be able to update a row in a table.

Inserting Rows

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INSERT

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: The system should be able to add a row to a table.

Deleting Rows

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DELETE

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: The system should be able to delete a row from a table by index.

Inner Join: The system should be able to perform an inner join of two tables.

Counting Rows

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COUNT

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: The system should return the number of rows in a given table.