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

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

Question #: 22
Topic #: 4

[All Databricks-Certified-Data-Analyst-Associate 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?

ASELECT PRICE customer_spend, customer_units AS customer_price FROM customer_summary

BSELECT price FROM customer_summary

CSELECT function(price(customer_spend, customer_units)) AS customer_price FROM customer_summary

DSELECT double(price(customer_spend, customer_units)) AS customer_price FROM customer_summary

ESELECT price(customer_spend, customer_units) AS customer_price FROM customer_summary

Show Suggested 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

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

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Ardella

1 months ago

Option E is the way to go. Keeping it simple is the key to success in these exams.

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Lai

1 months ago

I think A is also a possible answer because it renames the columns as customer_price.

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Rozella

1 months 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

1 months 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

1 months 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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Azzie

6 days ago

User1: Yeah, I don't think we need to use the 'double' function like in option D. Option E should work just fine.

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Jodi

17 days ago

I agree with you. Option E looks the most straightforward and correct.

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Elroy

18 days ago

Yeah, I think we can eliminate option D and focus on options A, B, C, and E.

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Precious

22 days ago

I'm not sure about option D either. Using the 'double' function seems unnecessary.

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Latanya

25 days ago

I think option E is the correct one. It directly applies the price function to customer_spend and customer_units columns.

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Viva

26 days ago

I agree with you, option E looks like the most straightforward choice.

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Dominga

1 months ago

I think option E is the correct one. It directly applies the price function to customer_spend and customer_units columns.

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Ernest

1 months ago

I agree with Jennie, E seems like the right choice.

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Joesph

2 months 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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Melynda

23 days ago

I'm not sure, but I think option A might be the correct answer. It seems to be selecting customer_spend and customer_units columns and aliasing them as customer_price.

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