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Question 586 - COF-C02 discussion

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Which types of subqueries does Snowflake support? (Select TWO).

A.
Uncorrelated scalar subqueries in WHERE clauses
Answers
A.
Uncorrelated scalar subqueries in WHERE clauses
B.
Uncorrelated scalar subqueries in any place that a value expression can be used
Answers
B.
Uncorrelated scalar subqueries in any place that a value expression can be used
C.
EXISTS, ANY / ALL, and IN subqueries in WHERE clauses: these subqueries can be uncorrelated only
Answers
C.
EXISTS, ANY / ALL, and IN subqueries in WHERE clauses: these subqueries can be uncorrelated only
D.
EXISTS, ANY / ALL, and IN subqueries in where clauses: these subqueries can be correlated only
Answers
D.
EXISTS, ANY / ALL, and IN subqueries in where clauses: these subqueries can be correlated only
E.
EXISTS, ANY /ALL, and IN subqueries in WHERE clauses: these subqueries can be correlated or uncorrelated
Answers
E.
EXISTS, ANY /ALL, and IN subqueries in WHERE clauses: these subqueries can be correlated or uncorrelated
Suggested answer: B, E

Explanation:

Snowflake supports a variety of subquery types, including both correlated and uncorrelated subqueries. The correct answers are B and E, which highlight Snowflake's flexibility in handling subqueries within SQL queries.

Uncorrelated Scalar Subqueries: These are subqueries that can execute independently of the outer query. They return a single value and can be used anywhere a value expression is allowed, offering great flexibility in SQL queries.

EXISTS, ANY/ALL, and IN Subqueries: These subqueries are used in WHERE clauses to filter the results of the main query based on the presence or absence of matching rows in a subquery. Snowflake supports both correlated and uncorrelated versions of these subqueries, providing powerful tools for complex data analysis scenarios.

Examples and Usage:

Uncorrelated Scalar Subquery:

SELECT * FROM employees WHERE salary > (SELECT AVG(salary) FROM employees);

Correlated EXISTS Subquery:

SELECT * FROM orders o WHERE EXISTS (SELECT 1 FROM customer c WHERE c.id = o.customer_id AND c.region = 'North America');

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asked 23/09/2024
JAVIER MALDONADO
31 questions
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