MS SQL Server - 24 - Subqueries MCQ

24 – Subqueries MCQ

Best of luck!

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1. What is a subquery in SQL Server?

A query that returns multiple result sets

A query that aggregates data

A query used to create tables

A query nested inside another query

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2. In SQL Server, which operator is used to compare a single value to the result set of a subquery?

BETWEEN

AND

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3. What does the = operator in a subquery’s WHERE clause typically represent?

Less than

Equal to

Not equal to

Greater than

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4. When using a subquery with the IN operator, what does it check for?

Existence

Inequality

All of the above

Equality

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5. What is the primary purpose of the IN operator when used with a subquery?

To check if a value exists in a set of values

To return the maximum value

To concatenate strings

To compare a value with a range

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6. In SQL Server, when using the IN operator with a subquery, how many values can the subquery return?

It depends on the subquery

Only one value

Multiple values

Two values

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7. What does the ALL operator do when used with a subquery in SQL Server?

Checks if any value in the subquery matches the condition

Performs a cross join with the subquery

Checks if all values in the subquery match the condition

Returns all rows from the subquery

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8. Which of the following comparison operators can be used with the ALL operator in SQL Server?

All of the above

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9. When using the ANY operator with a subquery in SQL Server, what is it typically used to compare?

Only NULL values

Two subqueries

A range of values to a single value

A single value to multiple values

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10. What is the result of a subquery with the ANY operator if at least one value in the subquery meets the condition?

True

An error is thrown

NULL

False

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11. In SQL Server, which operator is used to compare a value to a list of values in a subquery?

ANY

EXISTS

BETWEEN

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12. When using a subquery with the ALL operator, what is the result if all values in the subquery meet the condition?

NULL

An error is thrown

True

False

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13. What is the purpose of the EXISTS operator when used with a subquery in SQL Server?

To check if any row exists in the subquery result

To compare two subqueries

To check if a column exists in a table

To return all rows from the subquery

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14. Which of the following comparison operators can be used with the EXISTS operator in SQL Server?

NOT

All of the above

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15. What does the NOT operator do when used with a subquery in SQL Server?

Negates the result of the subquery

Throws an error

Performs an inner join with the subquery

Returns all rows from the subquery

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16. In SQL Server, how is a subquery different from a JOIN operation?

Subqueries always return a single result set

Subqueries cannot be used in SELECT statements

JOIN operations always use the EXISTS operator

JOIN operations are more efficient than subqueries

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17. Which of the following is true about correlated subqueries in SQL Server?

They cannot be used with the IN operator

They are faster than non-correlated subqueries

They can reference columns from the outer query

They are always nested within a CASE expression

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18. What is the result of a subquery with the ALL operator if any value in the subquery does not meet the condition?

An error is thrown

NULL

False

True

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19. In SQL Server, which comparison operator is used to check if a value is within a specified range?

BETWEEN

NOT

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20. When using a subquery with the NOT IN operator, what does it check for?

Equality

Existence

All of the above

Inequality

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21. In SQL Server, what is the primary use of the HAVING clause in a query with GROUP BY?

To filter groups after grouping

To specify columns for grouping

To filter rows before grouping

To join multiple tables

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22. Which SQL Server comparison operator is used to check if a value is not equal to a specified value?

IS NOT

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23. What is the result of a subquery with the NOT EXISTS operator if any row exists in the subquery result?

False

An error is thrown

NULL

True

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24. When using a subquery with the ALL operator, how are the values in the subquery compared to the outer query?

Using logical XOR

Using logical NOT

Using logical OR

Using logical AND

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25. Which operator can be used to compare a value to a subquery result that returns a single value in SQL Server?

NOT

ALL

ANY

EXISTS

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26. In SQL Server, what is the primary use of the NOT LIKE operator?

To check for NULL values

To filter rows based on a pattern match

To join tables

To perform a case-sensitive search

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27. In a subquery with the ALL operator, if the subquery returns an empty result set, what is the result?

False

True

NULL

An error is thrown

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28. What is the purpose of the ALL operator when used with a subquery in SQL Server?

To compare a value with all values in the subquery

To return all rows from the subquery

To negate the result of the subquery

To check if a subquery exists

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29. In SQL Server, what is the result of a subquery with the IN operator if the subquery returns NULL

False

An error is thrown

True

NULL

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MS SQL Server – 24 – Subqueries MCQ