The value for an attribute or a column are drawn from a set of values known as what?

Question

The value for an attribute or a column are drawn from a set of values known as what? 1) Tuples 2) Attributes 3) Domain 4) Column

Answer 1

四个选项的答案是3）域。

Answer 2

attribute drawn from a set of values ie domain (3. Domain - is the answer)

*if attributes drawn from atomic value domain called SIMPLE attributes.

• eg: name: {myName} , age : {23}

*if attributes drawn from set of value domain called MULTIVALUED attributes.

• eg: phone:{12334, 3242223, 234324}