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Software ==>	Postgres SQL (18 exercises)
Topic ==>	Calculations (8 exercises)
Level ==>	Relatively easy
Subject ==>	PostgreSQL training

Use the CASE expression to calculate the correct certifications for albums based on sales

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If you don't have a copy of the music_01 database, first follow the instructions at the following link to create it: https://www.wiseowl.co.uk/postgres/exercises/postgres-sql/using-postgres/5350/

Write a query to select the Title and US_Billboard_200_peak columns from the Album table, sorting the results in reverse alphabetical order by album title.

Include a criteria to show only albums where the us_sales_m figure is not null.

The RIAA categorises albums based on sales according to the following criteria:

Sales (millions)	Category
10 or more	Diamond
2 or more	Multi-platinum
1 or more	Platinum
0.5 or more	Gold
Anything else	NA

Add a calculated columnto your query using a CASE expression to categorise albums according to the table shown above. Here's a reminder of the CASE expression syntax:

CASE

WHEN Condition 1 THEN Answer 1

...

ELSE Final answer

END

Run your query and check that it returns the correct results.

You should see the certification rating against each album.

Save the script as Precious metals.sql and then close it down.

You can find other training resources for the subject of this exercise here:

Classes in PostgreSQL

You can also book hourly online consultancy for your time zone with one of our 7 expert trainers!

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EXERCISE TOPIC

POSTGRESQL EXERCISES

POSTGRES SQL EXERCISES

Use the CASE expression to calculate the correct certifications for albums based on sales

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