Relational Algebra Notes Questions with Answers PDF Download – Test 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