Chap007 - Chapter 7 Information Retrieval from Relational...

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Chapter 7, Information Retrieval from Relational Databases True/False Questions 1. Query by Example (QBE) requires the end user to be able to construct a complex SQL Statement. Ans: False Response: QBE allows end users to create queries without knowing SQL. 2. A horizontal subset includes only some of the rows in the table and all of the table's columns. Ans: True 3. Relational Algebra allows for multiple operations in a single query. Ans: False Response: A separate query must be written for each operation in relational algebra. 4. A Microsoft Access dynaset looks and behaves like a table but is not stored as a table. Ans: True 5. Ad hoc querying is done primarily by professional database developers who use SQL. Ans: False Response: Ad hoc querying is typically done by end users. 6. You can perform a right outer join on tables that do not share a common field. Ans: False Response: Tables must share a common field to be joined with any type of join. 7. A full outer join will show records that contain NULL values. Ans: True Dunn/Cherrington/Hollander, Enterprise Information Systems: A Pattern Based Approach, 3e 1
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Chapter 7, Information Retrieval from Relational Databases 8. The following tables cannot be joined: T a b l e 1 T a b l e 2 E m p l o y e e I D O r d e r N u m b e r D e p t I D D e s c r i p t i o n A d d r e s s D e p t I D Ans: False Response: The tables share Dept ID therefore they can be joined. 9. The criteria field in the query design for Microsoft Access accepts Relational Algebra language syntax. Ans: False Response: Mathematical comparison or logical operators are used in the criteria field. 10. A query in Microsoft Access takes a subset of data contained in a table and creates another table on which you can perform multiple queries. Ans: False Response: A query in Microsoft Access generates a view, which looks like a table but isn’t a table. 11. Microsoft Access uses only a QBE method for query creation. Ans: False Response: Queries may also be formulated in SQL in Microsoft Access. 12. Every SQL statement begins with the word PROJECT. Ans: False Response: SQL statements begin with the word SELECT. 13. The SELECT component of a SQL query statement specifies which attributes are to be included in the answer to the query. Ans: True 14. An SQL query statement that accomplishes only the relational algebra PROJECT operation would not include a WHERE clause. Ans: True 2 Dunn/Cherrington/Hollander, Enterprise Information Systems: A Pattern Based Approach, 3e
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Chapter 7, Information Retrieval from Relational Databases 15. A single SQL query statement can accomplish relational algebra select, project, and join operations. Ans: True 16. Right outer join queries can only be created in relational algebra. Ans: False Response: Right outer join queries can be created in structured query language and in QBE.
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