20. quiz
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Transcript of 20. quiz
Quiz About
Normalization
Question 1
Second Normal form is designed
to A. Ensure that a table is in
first normal form is decomposed into two fields
C. Ensure that every non key field in a record has a corresponding foreign key in atleast one other table
B. Ensure that a table that is in first normal form is decomposed into two or more tables
D. Ensure that every non key field in a record is fully functionally dependant upon the key field
Question 2
A Foreign key is
A.A field in a table that contains data that is also contained elsewhere in another table
C. A key that consists of more than one field
B. A field in a table that has the same name as a key field in another table
D. A field in a table that matches a key field in another table
A. 1990’s
C. 1980’s
B. 1970’s
D.1960’s
Question 3
The model for a relational
database was proposed in the
Question 4
A foreign key must
A. Have either a
matching value in
the
reffering(Primary)
table or be Null
C. Not be Null
B. Have a matching
value in the
referring(Primary)
table
D. Not contain the same
value more than
once
Question 5
Normalization is
A. The process of ensuring that each table has a key
C. A process whereby a limit is put on the number of fields a record can contain
B. A process whereby the design of a table(relation) is decomposed into more tables that more precisely fit the relational model
D. The process of ensuring that a relational database has at least two tables in it
Question 6
Third Normal form is designed to
A. Ensure there are no dependencies between keys & foreign keys
C. Ensure that the database contains three tables
B. Ensure that a table that is in second normal form is decomposed into two or more tables
D. Ensure that there are no transitive dependencies between non-key fields
Question 7
A transitive dependency
A. Is where field does not always depend upon the key field
C. Is where field A depends upon field B and field B is not a key field
B. Is where field A depends upon field B and field B is a key field
D. Is allowed in third normal form
Bonus Question
A one to many relationship(of table A to
table B) is
A. Where each record in table B can have one or more matching records in table A
C. Where each record in table A can have one or more matching records in table B
B. Where each record in table A is required to have a match in table B
D. Where each record in table B is required to have a match in table A
Key
• 1) D
• 2) D
• 3) B
• 4) A
• 5) B
• 6) D
• 7) C