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Question 54 - Professional Data Engineer discussion

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Suppose you have a table that includes a nested column called "city" inside a column called "person", but when you try to submit the following query in BigQuery, it gives you an error.

SELECT person FROM `project1.example.table1` WHERE city = "London"

How would you correct the error?

A.
Add ", UNNEST(person)" before the WHERE clause.
Answers
A.
Add ", UNNEST(person)" before the WHERE clause.
B.
Change "person" to "person.city".
Answers
B.
Change "person" to "person.city".
C.
Change "person" to "city.person".
Answers
C.
Change "person" to "city.person".
D.
Add ", UNNEST(city)" before the WHERE clause.
Answers
D.
Add ", UNNEST(city)" before the WHERE clause.
Suggested answer: A

Explanation:

To access the person.city column, you need to "UNNEST(person)" and JOIN it to table1 using a comma.

Reference:

https://cloud.google.com/bigquery/docs/reference/standard-sql/migrating-from-legacysql#nested_repeated_results

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asked 18/09/2024
Danyail Storey
28 questions
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