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The _________ construct returns true if the argument in the sub-query is void of duplicates
- a)not null
- b)not unique
- c)unique
- d)null
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The _________ construct returns true if the argument in the sub-query ...
Explanation:
Unique Construct:
- The unique construct is used in SQL to eliminate duplicate values in a sub-query.
- It returns true if the argument in the sub-query is void of duplicates.
Example:
- For example, if we have a table with the following values:
- ID Name
- 1 John
- 2 Jane
- 3 John
- Running a query with the unique construct in a sub-query like this:
- SELECT Name FROM table WHERE ID IN (SELECT DISTINCT ID FROM table)
- The query will return only unique values:
- John
- Jane
Explanation of Option C:
- The correct statement in the question is "The unique construct returns true if the argument in the sub-query is void of duplicates."
- This means that the unique construct will return true when there are no duplicate values present in the sub-query.
Conclusion:
- Therefore, option C "unique" is the correct choice as it accurately describes the behavior of the unique construct in SQL.
Unique Construct:
- The unique construct is used in SQL to eliminate duplicate values in a sub-query.
- It returns true if the argument in the sub-query is void of duplicates.
Example:
- For example, if we have a table with the following values:
- ID Name
- 1 John
- 2 Jane
- 3 John
- Running a query with the unique construct in a sub-query like this:
- SELECT Name FROM table WHERE ID IN (SELECT DISTINCT ID FROM table)
- The query will return only unique values:
- John
- Jane
Explanation of Option C:
- The correct statement in the question is "The unique construct returns true if the argument in the sub-query is void of duplicates."
- This means that the unique construct will return true when there are no duplicate values present in the sub-query.
Conclusion:
- Therefore, option C "unique" is the correct choice as it accurately describes the behavior of the unique construct in SQL.
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Community Answer
The _________ construct returns true if the argument in the sub-query ...
The unique construct returns true if the argument in the sub-query is void of duplicates. The not null construct avoids the specification of null values into the attribute.
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