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Exam Certified Data Engineer Associate All Questions

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Exam Certified Data Engineer Associate topic 1 question 21 discussion

Actual exam question from Databricks's Certified Data Engineer Associate
Question #: 21
Topic #: 1
[All Certified Data Engineer Associate Questions]

A data engineering team has two tables. The first table march_transactions is a collection of all retail transactions in the month of March. The second table april_transactions is a collection of all retail transactions in the month of April. There are no duplicate records between the tables.
Which of the following commands should be run to create a new table all_transactions that contains all records from march_transactions and april_transactions without duplicate records?

  • A. CREATE TABLE all_transactions AS
    SELECT * FROM march_transactions
    INNER JOIN SELECT * FROM april_transactions;
  • B. CREATE TABLE all_transactions AS
    SELECT * FROM march_transactions
    UNION SELECT * FROM april_transactions;
  • C. CREATE TABLE all_transactions AS
    SELECT * FROM march_transactions
    OUTER JOIN SELECT * FROM april_transactions;
  • D. CREATE TABLE all_transactions AS
    SELECT * FROM march_transactions
    INTERSECT SELECT * from april_transactions;
  • E. CREATE TABLE all_transactions AS
    SELECT * FROM march_transactions
    MERGE SELECT * FROM april_transactions;
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by XiltroX at April 1, 2023, 5:54 p.m.

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80370eb
3 months, 2 weeks ago
Selected Answer: B
B. CREATE TABLE all_transactions AS SELECT * FROM march_transactions UNION SELECT * FROM april_transactions;
upvoted 1 times
...
SerGrey
10 months, 3 weeks ago
Selected Answer: B
B is correct
upvoted 2 times
...
awofalus
1 year ago
Selected Answer: B
Correct: B
upvoted 1 times
...
ezeik
1 year, 2 months ago
UNION [ALL | DISTINCT] Returns the result of subquery1 plus the rows of subquery2`. If ALL is specified duplicate rows are preserved. If DISTINCT is specified the result does not contain any duplicate rows. This is the default. https://docs.databricks.com/en/sql/language-manual/sql-ref-syntax-qry-select-setops.html#examples
upvoted 4 times
...
vctrhugo
1 year, 2 months ago
Selected Answer: B
B. CREATE TABLE all_transactions AS SELECT * FROM march_transactions UNION SELECT * FROM april_transactions; To create a new table all_transactions that contains all records from march_transactions and april_transactions without duplicate records, you should use the UNION operator, as shown in option B. This operator combines the result sets of the two tables while automatically removing duplicate records.
upvoted 1 times
...
Atnafu
1 year, 4 months ago
B CREATE TABLE all_transactions AS SELECT * FROM march_transactions UNION SELECT * FROM april_transactions;
upvoted 1 times
...
prasioso
1 year, 6 months ago
Selected Answer: B
Answer is B.
upvoted 1 times
...
surrabhi_4
1 year, 7 months ago
Selected Answer: B
option B
upvoted 1 times
...
XiltroX
1 year, 7 months ago
Selected Answer: B
Answer is correct
upvoted 2 times
...

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