Oracle Schema

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ER Diagram

Below is an ER diagram that represents how the final set of tables fit together:

Note the following are missing:

• CUSTOMER: this is not part of the DEPT/EMP schema and is included in the booklet to show the problems of using a poorly designed table
• SALGRADE: is a reference table, used to look up the grade associated with a salary band
• BONUS: a subset of the EMP table, used to demonstrate the use of the CREATE TABLE AS ... command

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