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21. Row is synonymous with the term:
a. record
b. relation
c. column
d. field
Answer: (a).record

22. The primary key is selected from the:
a. composite keys
b. determinants
c. candidate keys
d. foreign keys
Answer: (c).candidate keys

23. Which of the following is a group of one or more attributes that uniquely identifies a row?
a. Key
b. Determinant
c. Tuple
d. Relation
Answer: (a).Key

24. A relation is considered a:
a. Column
b. one-dimensional table
c. two-dimensional table
d. three-dimensional table
Answer: (c).two-dimensional table

25. In the relational model, relationships between relations or tables are created by using:
a. composite keys
b. determinants
c. candidate keys
d. foreign keys
Answer: (d).foreign keys

26. Table is synonymous with the term:
a. record
b. relation
c. column
d. field
Answer: (b).relation

27. Which of the following is not a restriction for a table to be a relation?
a. The cells of the table must contain a single value.
b. All of the entries in any column must be of the same kind.
c. The columns must be ordered.
d. No two rows in a table may be identical.
Answer: (c).The columns must be ordered.

28. A key:
a. must always be composed of two or more columns.
b. can only be one column.
c. identifies a row.
d. identifies a column.
Answer: (c).identifies a row.

29. An attribute is a(n):
a. column of a table.
b. two dimensional table.
c. row of a table.
d. key of a table.
Answer: (a).column of a table.

30. A tuple is a(n):
a. column of a table.
b. two dimensional table.
c. row of a table.
d. key of a table.
Answer: (c).row of a table.

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