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- Mail Master table
- MailID (PK)
- Mail content
- Emp Master table
- EmpID (PK)
- EmpName
- Mail-Employee Mapping table
- Mail-Employee_ID (auto increament id PK)
- MailID (FK)
- EmployeeID (FK)
- Group_Master table
- GroupID (auto increament PK)
- GroupName
- Group_Employee_Mapping table
- Group_Employee_ID (auto increament)
- GroupID (FK)
- EmployeeID (FK)
- (GroupID+Employee are unique so Composite PK)
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