IT CS1011 Unit 1 Milestone- RETAKE WGU 2023

32/36 << that's 89% RETAKE



® 32 questions were answered correctly.
4 questions were answered incorrectly.




Te
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.


https://postgres.sophia.org/


Using the WHERE clause, filter the invoice table to find the
invoices dated January 15th, 2011.


Identify the 2nd customer ID of the invoices.




O 35




O 27




Oo 31




© 0 29




RATIONALE

,A common mistake when filtering dates can be incorrectly
identifying the day, month, and year, as different countries may list
them in a different order. Always check your data first to ensure the
correct order of the day, month, and year. Other common errors are
using the wrong inequality comparison (e.g., > rather than <),
filtering on the wrong column of data, and using the wrong data
table. Also, make sure that you use the correct format for the date,
using yyyy-mm-dd.


CONCEPT
— Filter by Date

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2 @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.


https://postgres.sophia.org/


Using the IN operator, filter the invoice table to find those
with the billing city set to Paris, London, New York, or Brussels.


Identify the billing postal code of the 4th record.




O SW1V 3EN




O 1000




© 0 75002




75009

,RATIONALE
Common mistakes include filtering the wrong column of data, using
the wrong table, not using commas to separate out each criterion,
omitting single quotes around string data, and incorrectly spelling
the values.


CONCEPT
— IN to Filter Data

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2 @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.


https://postgres.sophia.org/


Identify the correctly constructed ALTER TABLE statement that
removes the age column from the user table.




ALTER TABLE user ADD age int;
O


© o ALTER TABLE user DROP age;




ALTER TABLE user DROP
O age_now;




O ALTER TABLE user DROP age int;




RATIONALE

, Common mistakes when adding or dropping a column include
incorrectly naming the table or column names, not including the
data type and size when adding a column, and using the incorrect
syntax structure of the ALTER TABLE command.


CONCEPT
— ALTER TABLE to Change Columns: Add/Drop

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4“ @
In each milestone, you may want or need to use the database
and query tool to answer some of the questions. We suggest you
open the tool in another browser tab while you are working on
this assessment.


https://postgres.sophia.org/


Using the GROUP BY and HAVING clauses, filter the customer
table by country.


How many countries have less than 2 customers?




O 17




O 0




© 0 15




O 18




RATIONALE
Common mistakes when using the HAVING clause with the GROUP
BY clause in a SELECT statement include: not using aggregate