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Databricks Certified Data Analyst Associate Exam - Topic 4 Question 1 Discussion

Actual exam question for Databricks's Databricks Certified Data Analyst Associate exam
Question #: 1
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?

A)

CREATE TABLE table_silver AS

SELECT DISTINCT *

FROM table_bronze;

B)

CREATE TABLE table_silver AS

INSERT *

FROM table_bronze;

C)

CREATE TABLE table_silver AS

MERGE DEDUPLICATE *

FROM table_bronze;

D)

INSERT INTO TABLE table_silver

SELECT * FROM table_bronze;

E)

INSERT OVERWRITE TABLE table_silver

SELECT * FROM table_bronze;

Show Suggested Answer Hide 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 Alishia at Jan 24, 2024, 10:00 PM

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Brice
6 months ago
Option C? Never heard of that syntax before. Is it even valid?
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Cristina
6 months ago
Totally agree with A! It's the simplest and most effective.
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Ethan
6 months ago
Wait, can you really use "MERGE DEDUPLICATE"? Sounds off.
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Melita
7 months ago
I think Option B could work too, but not for deduplication.
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Raelene
7 months ago
Option A is definitely the way to go!
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Cristy
7 months ago
I don't think MERGE DEDUPLICATE is a standard SQL command, so Option C seems wrong. But I'm not completely confident about the others either.
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Brandee
7 months ago
I feel like we practiced a similar question where we had to create a new table without duplicates. Option A sounds familiar, but I can't recall if there were other methods we discussed.
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Rashad
7 months ago
I'm not entirely sure, but I think INSERT INTO might just add more duplicates instead of removing them. So, maybe not Option D?
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Josefa
8 months ago
I remember we discussed using DISTINCT to remove duplicates in SQL. Option A seems like the right choice.
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Deandrea
8 months ago
Option B with the "INSERT *" syntax looks a bit strange to me. I don't think that's valid SQL, so I'll probably rule that one out.
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Bong
8 months ago
Option C mentions "MERGE DEDUPLICATE", which sounds promising, but I'm not familiar with that syntax. I'll have to double-check the documentation to see if that's a valid SQL operation.
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Ty
8 months ago
I'm a bit unsure about the difference between Option D and Option E. Both seem to be using INSERT statements, but I'm not sure if there's a meaningful difference between them.
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Tomoko
8 months ago
Hmm, this looks like a pretty straightforward deduplication task. I think Option A with the DISTINCT keyword is the way to go here.
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Pearlie
8 months ago
I'm leaning towards Option A as well. The DISTINCT keyword is a classic way to remove duplicates, and it's a simple and reliable solution.
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Dawne
8 months ago
I think this is a pretty straightforward question. The security guards likely have the right to check IDs and bags for safety reasons, so I'll go with A.
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Raelene
8 months ago
Hmm, I'm a little unsure about this one. I'll need to carefully review the Scrum principles and how they relate to risk management.
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Annice
8 months ago
I'm a little unsure here. I'll need to review my notes on the different accounting pronouncements to make sure I choose the right one.
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