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Exam Certified Data Engineer Associate topic 1 question 19 discussion

Actual exam question from Databricks's Certified Data Engineer Associate
Question #: 19
Topic #: 1
[All Certified Data Engineer Associate Questions]

A data engineer runs a statement every day to copy the previous day’s sales into the table transactions. Each day’s sales are in their own file in the location "/transactions/raw".
Today, the data engineer runs the following command to complete this task:

After running the command today, the data engineer notices that the number of records in table transactions has not changed.
Which of the following describes why the statement might not have copied any new records into the table?

  • A. The format of the files to be copied were not included with the FORMAT_OPTIONS keyword.
  • B. The names of the files to be copied were not included with the FILES keyword.
  • C. The previous day’s file has already been copied into the table.
  • D. The PARQUET file format does not support COPY INTO.
  • E. The COPY INTO statement requires the table to be refreshed to view the copied rows.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by knivesz at April 4, 2023, 2:03 a.m.

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awofalus
1 month ago
Selected Answer: C
C is correct
upvoted 1 times
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kishanu
1 month, 3 weeks ago
If the table "transaction" is an external table, then option E, if its internal C should suffice.
upvoted 1 times
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DavidRou
2 months ago
Selected Answer: C
COPY INTO statement does skip already copied rows.
upvoted 1 times
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KalavathiP
2 months, 2 weeks ago
Selected Answer: C
C is correct ans
upvoted 1 times
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ezeik
2 months, 2 weeks ago
Selected Answer: E
E is the correct answer, because immediately after using copy into you might query the cashed version of the table.
upvoted 2 times
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AndreFR
3 months, 3 weeks ago
Selected Answer: C
https://docs.databricks.com/en/ingestion/copy-into/index.html The COPY INTO SQL command lets you load data from a file location into a Delta table. This is a re-triable and idempotent operation; files in the source location that have already been loaded are skipped. if there are no new records, the only consistent choice is C no new files were loaded because already loaded files were skipped.
upvoted 1 times
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Atnafu
5 months ago
C The COPY INTO statement copies the data from the specified files into the target table. If the previous day's file has already been copied into the table, then the COPY INTO statement will not copy any new records into the table.
upvoted 1 times
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junction
6 months, 2 weeks ago
Selected Answer: C
COPY INTO Loads data from a file location into a Delta table. This is a retriable and idempotent operation—files in the source location that have already been loaded are skipped.
upvoted 1 times
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testdb
6 months, 3 weeks ago
Selected Answer: B
Answer: B FILES = ('f1.json', 'f2.json', 'f3.json', 'f4.json', 'f5.json') https://docs.databricks.com/ingestion/copy-into/examples.html
upvoted 1 times
[Removed]
6 months, 3 weeks ago
The correct answer is letter C. The use of specific files names with keyword "FILES" is optional as the syntax of COPY INTO declares: [ FILES = ( file_name [, ...] ) | PATTERN = glob_pattern ] When keyword FILES is not used in the statement all files of the directory is used once (because this operation is idempotent).
upvoted 2 times
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Varma_Saraswathula
7 months, 3 weeks ago
C- https://docs.databricks.com/ingestion/copy-into/tutorial-notebook.html Because this action is idempotent, you can run it multiple times but data will only be loaded once.
upvoted 1 times
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XiltroX
8 months, 1 week ago
Selected Answer: C
Option C is the correct answer.
upvoted 3 times
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mimzzz
8 months, 1 week ago
i am not sure whether C is the correct answer, but A is definitely not right
upvoted 1 times
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sdas1
8 months, 1 week ago
option C
upvoted 1 times
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knivesz
8 months, 1 week ago
Selected Answer: C
Respuesta C, por descarte, A) No es necesario B) No se coloca FILES D) PARQUET si es soportado E) No es necesario refrescar la vista, ya que se esta copiando un archivo
upvoted 2 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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