In SQL, which statement is used to change a user's password? MCQ with Answer and Explanation
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Question #1
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Which SQL component is used to specify a fallback default value for a column when no value is provided during an insert operation?
Correct Answer: Option D
Explanation:
The DEFAULT constraint assigns a predefined default value to a column when an INSERT statement does not explicitly provide a value for that column.
The DEFAULT constraint assigns a predefined default value to a column when an INSERT statement does not explicitly provide a value for that column.
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Computer
Database Management System (DBMS)
Question #2
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What is the role of the 'WHERE' clause in an UPDATE statement?
Correct Answer: Option A
Explanation:
The WHERE clause in UPDATE identifies the rows that will be updated. Without it, all rows would be updated.
The WHERE clause in UPDATE identifies the rows that will be updated. Without it, all rows would be updated.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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What does a database constraint called a 'CHECK' constraint do?
Correct Answer: Option B
Explanation:
A CHECK constraint enforces domain integrity by limiting the values accepted by a column to only those that satisfy a specified Boolean predicate.
A CHECK constraint enforces domain integrity by limiting the values accepted by a column to only those that satisfy a specified Boolean predicate.
This question belongs to:
Computer
Database Management System (DBMS)
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