Question: Which one of the following allows us to uniquely identify the entity in the entity set?
Answer:
A key allows us to identify a set of attributes that suffice to distinguish entities from each other. Keys also help uniquely identify relationships and thus distinguish relationships from each other
MCQ: Which one of the following allows us to uniquely identify the entity in the entity set?
Explanation:
A key allows us to identify a set of attributes that suffice to distinguish entities from each other. Keys also help uniquely identify relationships and thus distinguish relationships from each other
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Related Questions
- 1. A_______is a set of one or more attributes that, taken collectively; allow us to identify uniquely an entity in the entity set.
- 2. A Super keys for which no proper subset is a super key. Such a minimal Super keys are called _______
- 3. We shall use the term ________ to denote a candidate key that is chosen by the database designer as the principal means of identifying entities within in an entity set.
- 4. The _______ should be chosen such that its attributes are never, or very rarely changed.
- 5. ________ is the columns of a table that points to the candidate key of another table.
- 6. The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.
- 7. The purpose of the foreign key is to identify a particular row of ___________.
- 8. The foreign key is equal to the candidate key in some row of the primary table, or else has no value (the NULL value.). This rule is called a ______ between the two tables.
- 9. ______ should not contain NULL value in its Attribute value.
- 10. An ER diagram can express the overall __________of a database graphically
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