Two or more attributes that can be a key are called :

Related MCQs

• When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):
• When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):
• A relation is said to be in 3 NF if (i) it is in 2 NF (ii) non-key attributes are independent of one another (iii) key attribute is not dependent on part of a composite key (iv) has no multi-valued dependency
• State true or false i) A candidate key is a minimal super key. ii) A candidate key can also refer to as surrogate key.
• A functional dependency between two or more non-key attributes is called
• There are similarities between the instructor entity set and the secretary entity set in the sense that they have several attributes that are conceptually the same across the two entity sets: namely, the identifier, name, and salary attributes. This process is called
•                          is a combination of two of more attributes used as a primary key
• .............. is a combination of two of more attributes used as a primary key
• A super key is a set of one or more attributes that, taken collectively, allow us
• A                    integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.