Exercise: Table variable - C# and Gabriella 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 ==> Temporary tables and table variables  (10 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.

The aim of this exercise is to create a table variable holding all of those course ids where the course is either:

  • About C#; or
  • Given by Gabriella Montez (the techiest trainer).

To do this, first declare a table variable called @TechieCourses to hold one column only - each course's ScheduleId.

Insert into this table all of those courses which have C# in the course name:

SQL exercise - Temporary tables and table variables (image 1)

These are the two tables you will need to join

Now insert into the same table all those courses where the TrainerIds column contains number 2936 (that's Gabriella).  To do this, add a comma to the start and end of each of the things you're comparing:

SQL exercise - Temporary tables and table variables (image 2)

What your WHERE condition might look like

Create a SELECT statement joining your temporary table to the table of courses to show your results in course date order:

SQL exercise - Temporary tables and table variables (image 3)

The first of the 72 rows your query should return

Optionally, save this query as Techie courses.sql, then close it down.

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