Relational Algebra Quiz PDF: Questions and Answers - 171

MCQ 851: The generated outputs of relational-algebra expressions do not have identities, which is used for

1. Reference
2. Comparison
3. Validate
4. Retrieval

MCQ 852: In queries that contain subqueries, a scoping rule is applied for

1. Variable names
2. Function names
3. Correlation names
4. Subquery name

MCQ 853: In the relational model, the process which involves decisions on what attributes we want to capture in the database, is

1. Conceptual design
2. Initial design
3. Execution design
4. Controlling design

MCQ 854: A database system provides a language named

1. Data declaration
2. Data definition
3. Data summification
4. Data moderation

MCQ 855: The pattern generated by the example "_ _ _" would be matching string of

1. Ending with three characters
2. Starting with three characters
3. Exactly three characters
4. At least three characters