WISE OWL EXERCISES
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SQL | Variables exercise | Using variables to filter a stored procedure
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 one of more of the courses listed below!
- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- Execute this script.
This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).
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The aim of this exercise is to generate a list of events that occurred in the year that you were born:
This shows the events for 1991, an especially good vintage.
To do this, first create two appropriately named variables to store the first date of your year of birth and the last, then use these variables to filter your results to show only events occurring between these two dates.
Use the BETWEEN operator to show dates that occur on or after the first day and on or before the last.
Change the value of your variables to a different year's start/end, and rerun your query to check that it gives the correct events:
The events occurring in 1964, for example (an even better vintage year, as it happens).
Thought: wouldn't it be nice if you could make a stored procedure pick up on different dates each time that you ran it? If only we could pass these variable values in as, say, parameters ...
Optionally save this as It was a good year.sql, then close it down.