How are MADlib functions typically invoked in a SQL query?

By using a special MADlib query language separate from SQL.

As stored procedures that require a separate programming language.

Through a REST API that sends requests to the database.

As user-defined functions called within a SELECT statement, similar to built-in SQL functions.

A data analyst needs to compute the 25th percentile of delivery_time for each shipping_zone in a PostgreSQL database. The result must be an actual delivery_time value from the dataset. Which SQL query should they use?

SELECT percentile_cont(0.25) WITHIN GROUP (ORDER BY delivery_time) FROM deliveries GROUP BY shipping_zone

SELECT ROW_NUMBER() OVER (PARTITION BY shipping_zone ORDER BY delivery_time) FROM deliveries

SELECT percentile_disc(0.25) WITHIN GROUP (ORDER BY delivery_time) FROM deliveries GROUP BY shipping_zone

SELECT AVG(delivery_time) FROM deliveries GROUP BY shipping_zone

A proprietary commercial tool for data visualization.

An open-source library that provides in-database machine learning and statistical functions for SQL.

A programming language used for big data processing.

A cloud-based data warehouse service.

A marketing team wants to build a linear regression model to predict customer lifetime value based on historical purchase data stored in PostgreSQL. The model must be trained in-database so that the training data never leaves the database server. Which approach should they take?

Use MADlib's linear regression function via a SQL query

Use a window function to calculate the regression coefficients

Use an ordered aggregate to fit the regression line

Export the data to a CSV file and train using an external R script

Dell Data Science Foundations

Domain 5Objective 5

Describe Advanced SQL Methods: Window Functions, Ordered Aggregates, and MADlib DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 4)

Part of the Advanced Analytics for Big Data - Technology and Tools domain, which accounts for 22% of the DATA-SCIENCE-FOUNDATIONS exam.

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Questions 16–20

16foundation · easy
How are MADlib functions typically invoked in a SQL query?
Select an answer first
17application · medium
A data analyst needs to compute the 25th percentile of delivery_time for each shipping_zone in a PostgreSQL database. The result must be an actual delivery_time value from the dataset. Which SQL query should they use?
Select an answer first
18foundation · easy
Which SQL clause is required when using an ordered aggregate like percentile_cont?
Select an answer first
19foundation · easy
What is MADlib?
Select an answer first
20application · medium
A marketing team wants to build a linear regression model to predict customer lifetime value based on historical purchase data stored in PostgreSQL. The model must be trained in-database so that the training data never leaves the database server. Which approach should they take?
Select an answer first

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Describe Advanced SQL Methods: Window Functions, Ordered Aggregates, and MADlib DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 4)

Questions 16–20

How are MADlib functions typically invoked in a SQL query?

A data analyst needs to compute the 25th percentile of delivery_time for each shipping_zone in a PostgreSQL database. The result must be an actual delivery_time value from the dataset. Which SQL query should they use?

Which SQL clause is required when using an ordered aggregate like percentile_cont?

What is MADlib?

A marketing team wants to build a linear regression model to predict customer lifetime value based on historical purchase data stored in PostgreSQL. The model must be trained in-database so that the training data never leaves the database server. Which approach should they take?

Keep studying — Advanced Analytics for Big Data - Technology and Tools