An ER diagram is an "Entity Relationship" diagram, which illustrates the relationships between the entities in a data model A data model for a timetable management system might have entities like Days, Periods and Rooms. Its ER Diagram would then show that a Day is broken down into multiple Periods, and each Room might be used for multiple Periods.
School Management System aimed to provide complete computerized operations in any school. Students can be managed through Bio-Data (GR No. Allotment), Attendance, Fees, Examination, Leaving modules.
Staff records can be computerized by Bio-Data > Staff Salary > Leaving modules. Accounting module is integrated with all other modules to getting rid of transaction duplication.
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