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Exam Certified Data Engineer Associate All Questions

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Exam Certified Data Engineer Associate topic 1 question 61 discussion

Actual exam question from Databricks's Certified Data Engineer Associate
Question #: 61
Topic #: 1
[All Certified Data Engineer Associate Questions]

Which of the following commands will return the number of null values in the member_id column?

  • A. SELECT count(member_id) FROM my_table;
  • B. SELECT count(member_id) - count_null(member_id) FROM my_table;
  • C. SELECT count_if(member_id IS NULL) FROM my_table;
  • D. SELECT null(member_id) FROM my_table;
  • E. SELECT count_null(member_id) FROM my_table;
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by kishanu at Oct. 20, 2023, 4:15 p.m.

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benni_ale
7 months ago
Selected Answer: C
C is correct
upvoted 1 times
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bartfto
10 months, 3 weeks ago
Selected Answer: C
C: There are no 'null' and 'count_null' functions in SparkSQL
upvoted 1 times
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55f31c8
12 months ago
Selected Answer: C
https://docs.databricks.com/en/sql/language-manual/functions/count_if.html
upvoted 4 times
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meow_akk
1 year, 1 month ago
Ans C : https://docs.databricks.com/en/sql/language-manual/functions/count.html Returns A BIGINT. If * is specified also counts row containing NULL values. If expr are specified counts only rows for which all expr are not NULL. If DISTINCT duplicate rows are not counted.
upvoted 3 times
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kishanu
1 year, 1 month ago
Selected Answer: C
count_if() can be used in this scenario
upvoted 3 times
...

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