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Database Systems Certification Exam Tests
Database Systems Practice Test 120
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The abstraction level that describes complex low-level data structures in detail, is
The third level of abstraction, that simplifies the user interaction to the system is
An index on an attribute of a relation is a data structure that allows database system to find tuples in relation that have specified value for attribute
The expression r -s represents a
Declarative DMLS requires a user to specify what data are needed and
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