MC	Statement A: The middle layer of the three-layer architecture consists of both the conceptual data model and the logical data model. The logical data model is physically implemented in the internal layer. <br><br> Statement B: The top level of the three-layer architecture is the external layer. Views for one or more applications always offer a window on the complete logical model.<br><br>Which sentence(s) is/are right?	Neither A or B is right	incorrect	Only sentence B is right	incorrect	Sentence A and B are right	incorrect	Only sentence A is right	correct	
MC	Complete the following sentence, choosing the right words on place <b>A</b> and <b>B</b>.<br><br>A ...<b>A</b>... data model is the mapping of a ...<b>B</b>... data model to a model that describes which data is stored where and in what format.	A: logical, B: conceptual	incorrect	A: logical, B: internal	incorrect	A: conceptual, B: internal	incorrect	A: internal, B: logical	correct	
MC	Consider this rule: "An employee of a department can never earn more than the manager of the department." This is an example of a:	Semantical integrity rule	correct	Syntactical integrity rule	incorrect	
MC	Which statement is CORRECT?	The database state specifies the various data items, their characteristiscs and relationships and is specified during the database design.	incorrect	The database state changes when data is updated or removed.	correct	The database state represents the data in the database when the database is first created.	incorrect	The database is stored in the catalog.	incorrect	
MC	Statement A: DDL is the language used to define the logical data model, but no other data models. <br><br> Statement B: SQL is a DML language to retrieve, insert, delete and modify data. It is stored in the catalog. <br><br>Which sentence(s) is/are right?	Neither A or B	correct	Only A	incorrect	A and B	incorrect	Only B	incorrect	
MC	Statement A: DDL is the language used to define the logical data model, but no other data models. <br><br> Statement B: SQL is a DML language to retrieve, insert, delete and modify data. It is stored in the catalog. <br><br>Which sentence(s) is/are right?	Only B	incorrect	Neither A or B	correct	Only A	incorrect	A and B	incorrect	
MC	Which statement is CORRECT?	In a file approach to data management, the data definitions are included in each application separately.	correct	The database state represents the data in the database when the database is first created.	incorrect	It is more cumbersome to query a database system than a file-based system.	incorrect	It is more cumbersome to query a database system than a file-based system.	incorrect	
MC	Which statement is CORRECT?	The database state specifies the various data items, their characteristiscs and relationships and is specified during the database design.	incorrect	The database is stored in the catalog.	incorrect	The database state changes when data is updated or removed.	correct	The database state represents the data in the database when the database is first created.	incorrect	
MC	Complete this sentence: In the three-layer architecture, between the external layer and the conceptual/logical layer, there is...	Physical data independence	incorrect	The internal layer	incorrect	Logical data independence	correct	No independence, they are basically the same thing	incorrect	
MC	Complete the following sentence, choosing the right words on place <b>A</b> and <b>B</b>.<br><br>A ...<b>A</b>... data model is the mapping of a ...<b>B</b>... data model to a model that describes which data is stored where and in what format.	A: conceptual, B: internal	incorrect	A: internal, B: logical	correct	A: logical, B: internal	incorrect	A: logical, B: conceptual	incorrect