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Linear Regression and Regularization

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Questions and Answers

What is the primary key in the devices table?

phone_number

did (correct)

customer_id

zip

What is the purpose of the FOREIGN KEY (caller_handset_id) REFERENCES devices in the calls table?

To create a bridge table between the devices and billing tables

To ensure data integrity by linking the calls table to the billing table

To implement a star schema in the data warehouse

To establish a relationship between the calls table and the devices table (correct)

What type of data is stored in the billing table?

Rate plans and associated fees (correct)

Call records with corresponding billing information

Cell tower information, including IDs and locations

Device information, including phone numbers and customer IDs

What is the UNIQUE constraint on the customer_id column in the devices table used for?

To prevent duplicate customer IDs Signup and view all the answers

What is the relationship between the calls and devices tables?

Many-to-one, with the calls table referencing the devices table Signup and view all the answers

Which of the following is an example of a fact table in a star schema?

calls Signup and view all the answers

What is the purpose of the registered_on column in the devices table?

To record the date the device was registered Signup and view all the answers

What would be the consequence of deleting a rate plan from the billing table?

The calls table would be unaffected Signup and view all the answers

What is the purpose of the cell_tower_id column in the calls table?

To track the location of the cell tower Signup and view all the answers

What is the data type of the call_start column in the calls table?

datetime Signup and view all the answers