Which database anomaly describes the necessity to update the exact same data value in multiple independent rows, creating a risk of data inconsistency? MCQ with Answer and Explanation
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Question #1
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Any set of one or more attributes that collectively allow us to uniquely identify tuples in a relation is termed as a what?
Correct Answer: Option D
Explanation:
A Super Key is any set of attributes within a table that can uniquely identify a row. A candidate key is a minimal super key.
A Super Key is any set of attributes within a table that can uniquely identify a row. A candidate key is a minimal super key.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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In SQL, which statement is used to change a user's password?
Correct Answer: Option D
Explanation:
ALTER USER is used in many DBMS to change user attributes, including password. The exact syntax varies by DBMS.
ALTER USER is used in many DBMS to change user attributes, including password. The exact syntax varies by DBMS.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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The total number of tuples (rows) contained within a relational database table is called its what?
Correct Answer: Option A
Explanation:
The number of tuples or rows in a relation is defined as the cardinality of that relation.
The number of tuples or rows in a relation is defined as the cardinality of that relation.
This question belongs to:
Computer
Database Management System (DBMS)
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