Exercise: Use CTE to list important people courses

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.

The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> SQL  (115 exercises)
Topic ==> Derived tables and CTEs  (7 exercises)
Level ==> Relatively easy
Course ==> Advanced SQL
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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If you haven't already done so, run the stored procedure in the above folder to generate a database of training courses and delegates.

Here are the tables that you will need to do the first part of this exercise:

SQL exercise - Derived tables and CTEs (image 1)

Initially we only need to show the people having a delegate count of 6 or more

Create a query to show the ids of the people who have attended 6 or more courses:

SQL exercise - Derived tables and CTEs (image 2)

There are only 3 people

Now turn this into a longer query to show the course names that these people have attended, using a CTE (common table expression)  (you'll need to join your CTE to the tblDelegate, tblSchedule and tblCourse tables to accomplish this):

SQL exercise - Derived tables and CTEs (image 3)

The first few of the 18 rows your query should return

Optionally, save this query as Important people courses, then close it down.

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