If this is in reference to diamond mining then above ground would be panning while below ground would be the actual mining into the soil.
The way a particular application views the data from the database that the application uses is a sub-schema.
<h3>What is Database?</h3>
A Database may be defined as a process of collecting data and information that is principally assembled for quick search and recoupment by a computer.
The sub-schema is the reasoning elucidation of that section of the database which is applicable and accessible to a specific application. This type of database is common to two or more applications.
Therefore, the sub-schema is the way through which a particular application views the data from the database that the application uses.
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