Professional-Data-Engineer Exam Dumps | Which of the following statements about Legacy SQL and Standard SQL is not true?

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Google.Professional-Data-Engineer.v2019-09-25.q120
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Question 24/120

Which of the following statements about Legacy SQL and Standard SQL is not true?

A. Standard SQL is the preferred query language for BigQuery.

B. If you write a query in Legacy SQL, it might generate an error if you try to run it with Standard SQL.

C. One difference between the two query languages is how you specify fully-qualified table names (i.e.
table names that include their associated project name).

D. You need to set a query language for each dataset and the default is Standard SQL.

Correct Answer: D

Explanation
You do not set a query language for each dataset. It is set each time you run a query and the default query language is Legacy SQL.
Standard SQL has been the preferred query language since BigQuery 2.0 was released.
In legacy SQL, to query a table with a project-qualified name, you use a colon, :, as a separator. In standard SQL, you use a period, ., instead.
Due to the differences in syntax between the two query languages (such as with project-qualified table names), if you write a query in Legacy SQL, it might generate an error if you try to run it with Standard SQL.
Reference:
https://cloud.google.com/bigquery/docs/reference/standard-sql/migrating-from-legacy-sql

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