Databricks Exam Databricks-Certified-Data-Analyst-Associate Topic 4 Question 20 Discussion

Actual exam question for Databricks's Databricks-Certified-Data-Analyst-Associate exam

Question #: 20
Topic #: 4

[All Databricks-Certified-Data-Analyst-Associate Questions]

A data analysis team is working with the table_bronze SQL table as a source for one of its most complex projects. A stakeholder of the project notices that some of the downstream data is duplicative. The analysis team identifies table_bronze as the source of the duplication.

Which of the following queries can be used to deduplicate the data from table_bronze and write it to a new table table_silver?

CREATE TABLE table_silver AS

SELECT DISTINCT *

FROM table_bronze;

CREATE TABLE table_silver AS

INSERT *

FROM table_bronze;

CREATE TABLE table_silver AS

MERGE DEDUPLICATE *

FROM table_bronze;

INSERT INTO TABLE table_silver

SELECT * FROM table_bronze;

INSERT OVERWRITE TABLE table_silver

SELECT * FROM table_bronze;

AOption A

BOption B

COption C

DOption D

EOption E

Show Suggested Answer

Suggested Answer: A

Option A uses theSELECT DISTINCTstatement to remove duplicate rows from thetable_bronzeand create a new tabletable_silverwith the deduplicated data.This is the correct way to deduplicate data using Spark SQL12. Option B simply inserts all the rows fromtable_bronzeintotable_silver, without removing any duplicates. Option C is not a valid syntax for Spark SQL, as there is noMERGE DEDUPLICATEstatement. Option D appends all the rows fromtable_bronzeintotable_silver, without removing any duplicates. Option E overwrites the existing data intable_silverwith the data fromtable_bronze, without removing any duplicates.Reference:Delete Duplicate using SPARK SQL,Spark SQL - How to Remove Duplicate Rows

by Eun at Aug 05, 2024, 04:23 PM

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Billye

3 months ago

Option C is like the SQL version of a magician's trick - 'MERGE DEDUPLICATE'? I'm half-expecting a rabbit to pop out of the hat along with the deduped data.

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Amie

3 months ago

Option B? Really? 'INSERT *'? What, are we going to insert the entire table into the new one? That's like trying to fit a square peg into a round hole.

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Josphine

3 months ago

C) Option C

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Gianna

3 months ago

A) Option A

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Launa

4 months ago

Option C is the way to go! 'MERGE DEDUPLICATE' - now that's some serious SQL magic right there. I bet the stakeholder will be impressed.

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Eulah

3 months ago

Definitely, using 'MERGE DEDUPLICATE' in SQL can streamline the process and ensure accurate results in table_silver.

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Val

3 months ago

I agree, Option C seems like the most efficient way to deduplicate the data and write it to table_silver.

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Shaun

3 months ago

Option C is the way to go! 'MERGE DEDUPLICATE' - now that's some serious SQL magic right there. I bet the stakeholder will be impressed.

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Darrin

4 months ago

I think option E might be the best choice to overwrite the data in table_silver with deduplicated data.

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Tyisha

4 months ago

Hmm, I'm torn between Options A and D. They both seem pretty solid, but I think I'll go with A. It just feels more elegant, you know?

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Matthew

4 months ago

I'm not sure, but I think option D might also work by inserting into table_silver.

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Alaine

4 months ago

I'm partial to Option E. It's a bit more concise and efficient, and it should give us the same result as Option A. Plus, it has a cool name - 'INSERT OVERWRITE'.

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