can u explain more clearly
schema is a way of physically displaying the database layout. As an example:
Employee {
EmpID, EmpName, Address, Phone, SSN, DeptID (FK)}
This would be the schema for the table Employee. EmpID is underlined to indicate it is a Primary Key and DeptID has FK in brackets to indicate it is a foreign key.
How a schema is written can depend on various factors. This is just one example. It is a broad term referring usually to the physical design structure of the tables in a database.