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ITM 209: SQL Exam Questions And Answers Latest Update 2024/2025
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ITM 209: SQL Exam Questions And Answers Latest Update 2024/2025
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ITM 209: SQL Exam Questions And AnswersLatest Update 2024/2025
The difference between a data lake and a data warehouse is: Answer: Data lakes store data in 'raw'
form (i.e. the original form). Data warehouses typically store data that has been extracted
Text in a novel is an example of structured data
TRUE/FALSE Answer: False
Which of the following is true regarding this query:
select
customer.name,
payment.date,
payment.amount,
from customer
left join payment on
customer.customerID = payment.customerID
order by customer.name asc, payment.data desc;
1: The results will be ordered by payment data and then by customer name
2: The results will show all customers, even if they have not made any payments
3: Customer John Adams will appear in the results before Jim Beasley
4: The results will only show customers who have made payments Answer: 2: The results will show
all customers, even if they have not made any payments
,Which of the following is used in a SQL statement where clause to show all records where a particular
attribute has null values
is null
= null
is empty
> null Answer: is null
Alex is conducting a query against a database of customers. The query counts the number of customer
in each city [count.customers.customerID)]. There is also a field for state. He wants to filter for cities
that have over 10 customers in Michigan.
What would be the correct code for this Answer: WHERE customers.state = "MI'
GROUP BY customers.city
HAVING count(customers.customerID) > 10
Match the following with the correct business analytics:
____ What will our sales be next quarter?
____ Should we make or buy an expensive part for our machines?
____ Did we make a profit last year?
1. Descriptive Analytic
2. Diagnostic Analytic
3. Predictive Analytic
, 4: Prescriptive Analytic Answer: 3 Predictive
4 Prescriptive
1 Descriptive
Jill has been asked to identify the number of invoices in a database that match certain criteria. Which
should she use in her query?
num( )
sum( )
count( )
avg( ) Answer: count( )
Mel is the owner of a campground in MI. It has a database containing the campers and their
reservations. Each reservation has an attribute for the number of nights. A camper can have many
reservations. Mel wants to filter for campers that reserved more than 10 nights during the year. Which
is the correct clause?
where sum(reservations.nights) >10
where count(reservations.nights) >10
having sum(reservations.nights) >10
with count(reservations.nights) >10
group by avg(reservations.nights) >10 Answer: having sum(reservations.nights) >10
Which of the following is an example of prescriptive analytics?
1: An energy company analyzing the top reasons for power outages over the past 5 years
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