डाटाबेस र DBMS – Database & DBMS MCQ
डाटाबेस र DBMS – कम्प्युटर र IT
Database & DBMS · Computer & IT (Technical) · ५६३ प्रश्न
५६३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
डाटाबेस र DBMS: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Which of the following is NOT one of the three basic Armstrong's axioms?
सही उत्तर: ख) Union
Union is a rule derived from the three basic axioms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fourth Normal Form (4NF) deals with:
सही उत्तर: घ) Multivalued dependency
4NF removes non-trivial multivalued dependencies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A relation is in Boyce-Codd Normal Form (BCNF) if, for every non-trivial functional dependency X -> Y:
सही उत्तर: घ) X is a super key
BCNF requires the left side of every non-trivial FD to be a super key.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Third Normal Form (3NF) removes:
सही उत्तर: क) Transitive dependency of non-key attributes on the key
3NF eliminates non-key attributes that depend on the key through another non-key attribute.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A relation is in First Normal Form (1NF) if:
सही उत्तर: ख) All attribute values are atomic
1NF requires each attribute to hold only atomic (indivisible) values.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When an ER diagram is converted to tables, a many-to-many relationship is usually represented by:
सही उत्तर: ख) A separate table containing the primary keys of both entities
An M:N relationship needs its own relation holding the keys of both participating entities.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a college, one department has many teachers but each teacher belongs to only one department. This relationship is:
सही उत्तर: ग) One-to-many
One department relates to many teachers, while each teacher relates to one department.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Candidate keys that are not selected as the primary key are called:
सही उत्तर: ग) Alternate keys
The remaining candidate keys are alternate keys.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A minimal super key (one with no unnecessary attribute) is called a:
सही उत्तर: ग) Candidate key
A candidate key is a super key from which no attribute can be removed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A foreign key is mainly used to enforce:
सही उत्तर: घ) Referential integrity
A foreign key ensures values refer to existing rows in the referenced table.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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