1) The Entity-Relationship (E-R) model is _____. E) a diagramming technique that
ID: 3590838 • Letter: 1
Question
1) The Entity-Relationship (E-R) model is _____.
E) a diagramming technique that relates entities to each other, attributes to each other, and relationships to each other
2) All of the following events and factors in the early 1980s led to the introduction of relational database management, except ____.
3) Performance issues delayed the introduction of relational database management systems as viable commercial products.
A) True B) False
4) The domain of values of the new column added to the relation to represent the unary one-to-many relationship is the same as that of the relation’s primary key.
A) True B) False
5) Representing a unary many-to-many relationship in a relational database requires the addition of one column to the relation that represents the single entity involved in the relationship.
A) True B) False
6) A unary many-to-many relationship involves two entities.
A) True B) False
7) A read or retrieve operation is the only one of the four fundamental operations that can be performed on a file that does change the data.
A) True B) False
8) Data redundancy _____.
9) An entity is the set of facts in a record.
A) True B) False
10) When different kinds of data (data about different entities) are merged in one file, a deletion anomaly _____.
A) a diagramming technique that describes record structures (i.e. the fields that make up the records of a file)Explanation / Answer
1.Answer:E
The Entity-Relationship (E-R) model is a diagramming technique that relates entities to each other, attributes to each other, and relationships to each other.
2.Answer:C
Yes the below events and factors in the early 1980s led to the introduction of relational database management, except ____the need for a DBMS approach that would make the database design process simpler than that of the hierarchical and network approaches.
3.Answer:
True
yes the performance issues delayed the introduction of relational database management systems as viable commercial products.
4.Answer:
False
NO,the domain of values of the new column added to the relation to represent the unary one-to-many relationship is the same as that of the relation’s primary key.
5.Answer:
False
NO the representing a unary many-to-many relationship in a relational database requires the addition of one column to the relation that represents the single entity involved in the relationship.
6.Answer:
TRUE
Yes, A unary many-to-many relationship involves two entities.
7.
False
no, read or retrieve operation is the only one of the four fundamental operations that can be performed on a file that does change the data.
8.Data redundancy can occur across multiple files but not within a single file.
9.TRUE
10. When different kinds of data (data about different entities) are merged in one file, a deletion anomaly is helpful in reducing the amount of redundant data presen
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