Databricks Certified Data Analyst Associate Exam - Topic 4 Question 11 Discussion

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

Question #: 11
Topic #: 4

[All Databricks Certified Data Analyst Associate Questions]

A data analyst has been asked to count the number of customers in each region and has written the following query:

If there is a mistake in the query, which of the following describes the mistake?

AThe query is using count('). which will count all the customers in the customers table, no matter the region.

BThe query is missing a GROUP BY region clause.

CThe query is using ORDER BY. which is not allowed in an aggregation.

DThere are no mistakes in the query.

EThe query is selecting region but region should only occur in the ORDER BY clause.

Show Suggested Answer

Suggested Answer: B

In the provided SQL query, the data analyst is trying to count the number of customers in each region. However, they made a mistake by not including the ''GROUP BY'' clause to group the results by region. Without this clause, the query will not return counts for each distinct region but rather an error or incorrect result.Reference: The need for a GROUP BY clause in such queries can be understood from Databricks SQL documentation:Databricks SQL.

I also noticed that you uploaded an image with your question. The image shows a snippet of an SQL query written in plain text on a white background. The query is attempting to select regions and count customers from a ''customers'' table and order the results by region. There's no visible syntax highlighting or any other color - it's monochromatic. The query is the same as the one in your question. I'm not sure why you included the image, but maybe you wanted to show me the exact format of your query. If so, you can also use code blocks to display formatted content such as SQL queries. For example, you can write:

SELECT region, count(*) AS number_of_customers

FROM customers

ORDER BY region;

This way, you can avoid uploading images and make your questions more clear and concise. I hope this helps.

by Barb at Apr 23, 2024, 10:15 AM

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Sherell

3 months ago

I thought region could be in the SELECT without GROUP BY?

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Olive

3 months ago

The count(') part is a common mistake, it counts all rows.

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Matthew

3 months ago

Wait, can you really use ORDER BY in an aggregation?

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Erasmo

4 months ago

I think the query is actually fine, no mistakes.

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Nan

4 months ago

Definitely missing a GROUP BY region clause!

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Ilda

4 months ago

I thought ORDER BY was allowed in aggregation queries, but now I'm questioning if it's necessary for this one. Could it be a mistake?

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Genevive

4 months ago

I recall that if you want to count customers by region, you definitely need to include GROUP BY region. That seems like the most logical mistake here.

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Linwood

4 months ago

I'm not entirely sure, but I feel like using count('*') should work fine for counting customers. Maybe it's just a syntax issue?

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Dorathy

5 months ago

I think the query might be missing a GROUP BY clause. I remember practicing something similar where grouping was essential for counting by categories.

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Angella

5 months ago

This is a good one. I feel confident that the answer is B - the query is missing the GROUP BY region clause. That's the key to getting the count per region.

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Rodrigo

5 months ago

Ah, I see the issue now. The query is missing the GROUP BY clause, which is necessary to get the count per region. That's got to be the mistake they're looking for.

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Alva

5 months ago

Okay, let's see here. The query is using COUNT(), so that's not the issue. I think the key is whether it's grouping the results by region or not.

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Shonda

5 months ago

Hmm, this one looks tricky. I'll need to carefully analyze the query and the options to identify the mistake.

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Mica

5 months ago

I'm a bit confused on this one. The query looks pretty straightforward, but the options are throwing me off. I'll need to double-check the SQL syntax to make sure I'm understanding this correctly.

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Ellsworth

5 months ago

This seems like a straightforward question about the benefits of using network configuration tools. I'm pretty confident I can identify the two valid options.

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Chauncey

5 months ago

I'm a bit confused on this one. I'm not sure if any of these options are directly related to the Request to Fulfill value stream. I might need to review my notes again.

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