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

Show venues with capacity bigger or smaller than average using subqueries

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 the average of the capacity field from the Venue table.

Average venue capacity

There's no need to give the column an alias or worry about formatting, as we will see in a moment.

Wrap another query around the first to show the following fields for venues whose capacity is larger than average, sorting the results in ascending order of capacity.

Venues with larger than average capacity

You should see 418 venues in yur list, sorted here into descending capaciity order.

Your subquery should be nested in the WHERE clause of the outer query. Don't forget to enclose the subquery in round brackets!

Write a similar query to show the venue or venues whose capacity equals the smallest capacity of all of the venues:

Smallest capacity venues

As it turns out we don't need to worry about sorting.

Save the script as Remember subquery brackets.sql and then close it down.

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

PostgreSQL training classes

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