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Databricks Exam Databricks-Certified-Data-Analyst-Associate Topic 4 Question 22 Discussion

Actual exam question for Databricks's Databricks Certified Data Analyst Associate Exam exam
Question #: 22
Topic #: 4
[All Databricks Certified Data Analyst Associate Exam Questions]

A data analyst has created a user-defined function using the following line of code:

CREATE FUNCTION price(spend DOUBLE, units DOUBLE)

RETURNS DOUBLE

RETURN spend / units;

Which of the following code blocks can be used to apply this function to the customer_spend and customer_units columns of the table customer_summary to create column customer_price?

Show Suggested Answer Hide Answer
Suggested Answer: E

A user-defined function (UDF) is a function defined by a user, allowing custom logic to be reused in the user environment1.To apply a UDF to a table, the syntax isSELECT udf_name(column_name) AS alias FROM table_name2. Therefore, option E is the correct way to use the UDFpriceto create a new columncustomer_pricebased on the existing columnscustomer_spendandcustomer_unitsfrom the tablecustomer_summary.Reference:

What are user-defined functions (UDFs)?

User-defined scalar functions - SQL

V


by Emile at Sep 10, 2024, 02:47 AM

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Lai
3 days ago
I think A is also a possible answer because it renames the columns as customer_price.
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Rozella
4 days ago
I'm not sure, but I think E makes sense because it directly applies the function to the columns.
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Miesha
4 days ago
Haha, I bet the answer is E. Who wants to do all that extra work with 'function' and 'double' when you can just call the function directly?
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Elin
5 days ago
Hmm, I'm not sure. Option D with the 'double' function seems a bit strange to me. Is that really necessary?
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Ernest
11 days ago
I agree with Jennie, E seems like the right choice.
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Joesph
17 days ago
I think option C is the correct answer. Using the function name directly within the SELECT statement is the way to go.
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Jennie
22 days ago
I think the correct answer is E.
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Matilda
1 months ago
Option E looks good to me. It's a straightforward way to apply the function and create the new column.
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Marge
13 days ago
Yes, I agree. It's the most logical choice.
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Lindsey
19 days ago
I think option E is the correct one.
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