![]() This level contains such details as the number of bytes for each data item, ordering of records, and data compression techniques.įor example, at this level we would describe the attribute SSN as.Ĭreation of an ER diagram, which is one of the first steps in designing a database, helps the designer(s) to understand and to specify the desired components of the database and the relationships among those components. However, we would not give the details of the physical storage of the fields and records. However, a billing clerk should have a very different view of the database. Science and Web-Accessed Databases as well as other applications.įor example, a doctor performing drug tests should be able to access the patients medical data but not their hospital bills. Genomic Databases, we studied some of the algorithms to process.
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