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Software ==>	Postgres SQL (35 exercises)
Topic ==>	Subqueries (2 exercises)
Level ==>	Average difficulty
Subject ==>	PostgreSQL training

Use subqueries to show a list of longer than average music albums and other interesting information!

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

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 rows from the Tour table where the Attendance is greater than average.

Tours with higher than average attendance

Sort the results in ascending order of attendance and then tour name.

Add a column which calculates the difference between each tour's attendance and the average of tour attendance (rounded to the nearest integer):

You'll need to include a subquery in the SELECT list to get these results.

Now write a second query to calculate the total length in seconds of albums in the Album table.

Multiply the minutes by 60 and add the seconds to get the total album length.

Use a subquery to return the albums which are longer than average, but by no more than 60 seconds. Include a column which shows how much longer than the average each album is:

Albums longer than average by less than 60 seconds

The list of the 10 albums which are longer than the average, but only just!

Save the script as Just a minute.sql and then close it.

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

PostgreSQL learning

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 subqueries to show a list of longer than average music albums and other interesting information!

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