Discuss Databricks Databricks Certified Data Engineer Associate Exam Topic 3 Question 32

Which of the following SQL keywords can be used to convert a table from a long format to a wide format?

Suggested Answer: A

The SQL keyword that can be used to convert a table from a long format to a wide format isPIVOT.The PIVOT clause is used to rotate the rows of a table into columns of a new table1.The PIVOT clause can aggregate the values of a column based on the distinct values of another column, and use those values as the column names of the new table1.The PIVOT clause can be useful for transforming data from a long format, where each row represents an observation with multiple attributes, to a wide format, where each row represents an observation with a single attribute and multiple values2.For example, the PIVOT clause can be used to convert a table that contains the sales of different products by different regions into a table that contains the sales of each product by each region as separate columns1.

The other options are not suitable for converting a table from a long format to a wide format.CONVERT is a function that can be used to change the data type of an expression3.WHERE is a clause that can be used to filter the rows of a table based on a condition4.TRANSFORM is a keyword that can be used to apply a user-defined function to a group of rows in a table5. SUM is a function that can be used to calculate the total of a numeric column.

1:PIVOT | Databricks on AWS

2:Reshaping Data - Long vs Wide Format | Databricks on AWS

3:CONVERT | Databricks on AWS

4:WHERE | Databricks on AWS

5:TRANSFORM | Databricks on AWS

: [SUM | Databricks on AWS]

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35 comments · newest first

Galen 10 months ago

CONVERT doesn't do that, just saying!

Marva 11 months ago

Wait, can you really use PIVOT for that? Seems too simple.

Tyisha 11 months ago

PIVOT is correct, no doubt about it!

Virgie 11 months ago

I thought TRANSFORM was the answer, but I guess not.

Blossom 11 months ago

Definitely A, PIVOT is the way to go!

Donette 12 months ago

I definitely remember PIVOT being the right choice for changing formats. I hope I got that right!

Allene 12 months ago

I vaguely recall that TRANSFORM is used in some SQL dialects, but I don't think it's standard SQL.

Willow 12 months ago

I'm not entirely sure, but I feel like CONVERT might be related to data types rather than table formats.

Ira 1 year ago

I think the keyword we're looking for is PIVOT. I remember practicing with it in a similar question.

Louis 1 year ago

The key here is understanding the difference between long and wide data formats. PIVOT is definitely the SQL keyword that can be used to convert a table from long to wide format. I feel pretty confident about this one.

Leoma 1 year ago

Okay, let me think this through step-by-step. We're looking for the SQL keyword that can convert a table from long to wide format. PIVOT seems like the most likely option, but I want to double-check the other choices just to be sure.

Aimee 1 year ago

Hmm, I'm not totally sure about this one. I know there are a few different ways to reshape data in SQL, but I can't remember the exact keyword for going from long to wide format. I'll have to think this through carefully.

Cecilia 1 year ago

This looks like a straightforward SQL question. I'm pretty confident the answer is PIVOT, since that's the keyword used to convert a table from long to wide format.

Lashawn 1 year ago

I'm a bit confused by this question. I know there are ways to reshape data in SQL, but I'm not familiar with the specific keywords for converting from long to wide format. I'll have to review my notes and try to reason through the options provided.

Amie 1 year ago

I'm a bit confused by the options. I'll have to eliminate the ones that don't sound like typical Facebook apps.

Dean 1 year ago

I'm pretty confident about this one. The Scrum Master's primary role is to facilitate the team and remove impediments, so I think the answer is B.

Brice 2 years ago

I'm not sure, but I think A) PIVOT is commonly used for converting tables.

Roxanne 2 years ago

Wait, is the answer 'SUM'? I'm just kidding, PIVOT is clearly the way to go.

Van 2 years ago

PIVOT? More like PIVOTAL for this question! *chuckles*

Corrinne 2 years ago

My money's on PIVOT. That's the one I remember learning about for this kind of data manipulation.

Mitsue 2 years ago

↳ replying to Corrinne

Yes, PIVOT is the correct keyword for converting a table from long to wide format.

Deja 2 years ago

↳ replying to Corrinne

I agree, PIVOT is the one we should use for this type of data transformation.

Eden 2 years ago

↳ replying to Corrinne

I think you're right, PIVOT is the keyword used for converting from long to wide format.

Marylou 2 years ago

I believe A) PIVOT is the correct keyword for this task.

Scarlet 2 years ago

Hmm, TRANSFORM sounds like it could be the answer, but I think PIVOT is the more specific keyword for this task.

Carlota 2 years ago

↳ replying to Scarlet

Yes, PIVOT is the keyword used to convert a table from long to wide format.

Willow 2 years ago

↳ replying to Scarlet

TRANSFORM might sound like it, but PIVOT is the correct keyword.

Joni 2 years ago

↳ replying to Scarlet

I agree, PIVOT is the specific keyword used for this task.

Charlette 2 years ago

↳ replying to Scarlet

I think PIVOT is the right keyword for converting a table from long to wide format.

Lennie 2 years ago

CONVERT? Really? That's more for data type conversion, not reshaping the data structure. I'll go with PIVOT.

Jess 2 years ago

I'm pretty sure the answer is PIVOT. That's the SQL keyword for transforming data from long to wide format.

Nobuko 2 years ago

↳ replying to Jess

Yes, PIVOT is the keyword for converting data from long to wide format.

Daron 2 years ago

↳ replying to Jess

I think you're right, PIVOT is used for that transformation.

Louvenia 2 years ago

I think D) TRANSFORM might also work.

Arlette 2 years ago

A) PIVOT can be used for that.

Databricks Certified Data Engineer Associate Exam - Topic 3 Question 32 Discussion