Database Systems Practice Test 171
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Relational Algebra Quiz with Answers PDF Download: MCQs 171
The generated outputs of relational-algebra expressions do not have identities, which is used for
- Reference
- Comparison
- Validate
- Retrieval
In queries that contain subqueries, a scoping rule is applied for
- Variable names
- Function names
- Correlation names
- Subquery name
In the relational model, the process which involves decisions on what attributes we want to capture in the database, is
- Conceptual design
- Initial design
- Execution design
- Controlling design
A database system provides a language named
- Data declaration
- Data definition
- Data summification
- Data moderation
The pattern generated by the example "_ _ _" would be matching string of
- Ending with three characters
- Starting with three characters
- Exactly three characters
- At least three characters
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