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Software ==>	Postgres SQL (19 exercises)
Topic ==>	Calculations (9 exercises)
Level ==>	Average difficulty
Subject ==>	PostgreSQL training

Use trimming and replacing to clear up messy names for album tracks

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 show a list of track names from the Track table, sorted in ascending order of name.

if you scroll down you'll see that some track names have quotation marks and some don't, making the order strange.

Add a calculated column which trims the track names and use this new column to sort the results.

This isn't obviously an improvement!

Some track names are wrapped in double quotes while others aren't. Add a calculated column which replaces any double quote with an empty string and then trims the results. Sort the results in ascending order of this new column.

The single quotation marks come first, as perhaps they should.

Add a WHERE clause which returns tracks whose cleaned-up name begins with A.

You'll have to repeat your calculated column in the WHERE clause of your query to get this more sensible ordered list.

Save the script as Tears of my tracks.sql and then close it down.

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

PostgreSQL classes

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

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POSTGRESQL EXERCISES

POSTGRES SQL EXERCISES

Use trimming and replacing to clear up messy names for album tracks

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