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Sample Count, Group By, and Aggregate Question

Sample question only. The task is similar to what will be evaluated during the exam.

Task

Imagine you have a table such as email_clicks below with the following fields.

field type
email_click_id int
customer_id int
email_id int
email_click_date date
email_subject varchar

Create a view that gets a list of all of the customer IDs that had multiple email_clicks. The output should be two columns – 1 for the customer_id and another for the number of email clicks.

Expected Output 

customer_id number_of_clicks
100 2

Sample Join Question

Sample question only. The task is similar to what will be evaluated during the exam. 

Task

Imagine you have tables such as email_clicks and customers below

email_clicks

field type
email_click_id int
customer_id int
email_id int
email_click_date date
email_subject varchar


customers

field type
customer_id int
customer_name varchar
customer_joined_date date 

 

Create a view that gets a list of all of the customer names that have clicked on at least one email. 

Expected Output

customer_name
Jane
Alex 

Finding Nulls Question

Sample question only. The task is similar to what will be evaluated during the exam.

Task

Imagine you have a table such as email_clicks below.

 

field type
email_click_id int
customer_id int
email_id int
email_click_date date
email_subject varchar

Create a view that gets a list of all of the customer_ids and email_ids that are missing an email_subject (i.e. the email_subject is NULL).

Expected Output

customer_id email_id
101 2000

 

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