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Questions and Answers
What is the primary key in the devices table?
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?
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?
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?
What is the UNIQUE constraint on the customer_id column in the devices table used for?
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What is the relationship between the calls and devices tables?
What is the relationship between the calls and devices tables?
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Which of the following is an example of a fact table in a star schema?
Which of the following is an example of a fact table in a star schema?
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What is the purpose of the registered_on column in the devices table?
What is the purpose of the registered_on column in the devices table?
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What would be the consequence of deleting a rate plan from the billing table?
What would be the consequence of deleting a rate plan from the billing table?
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What is the purpose of the cell_tower_id column in the calls table?
What is the purpose of the cell_tower_id column in the calls table?
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What is the data type of the call_start column in the calls table?
What is the data type of the call_start column in the calls table?
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