Question
In entity-relationship model, the attribute type can be:(choose the best response(s)) a. multi-valued attribute b. derived attribute c. single valued attribute d. simple attribute e.
In entity-relationship model, the attribute type can be:(choose the best response(s))
a. multi-valued attribute
b. derived attribute
c. single valued attribute
d. simple attribute
e. multi-valued composite attribute
In relational model, the attribute type can be
a. multi-valued attribute
b. single valued attribute
c. simple attribute
d. derived attribute
e. multi-valued composite attribute
Referential integrity constraint states
a. a foreign key value must refer to an existing primary key value
b. a foreign key value can be NULL.
c. either a. or b.
d. neither a. nor b.
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