Exercise: Basic loop to count events for each year

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 course listed below!

Category ==> SQL  (192 exercises)
Topic ==> Looping  (3 exercises)
Level ==> Average difficulty
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). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. 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).

You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.

The aim of this exercise is to create a query to show the number of films produced in each year that you have been alive, using a loop to run a separate select statement for each year:

Looping and printing the results

The first few results for a Wise Owl born in 1981.

See overleaf for details on how to do this.

The main parts of a loop are the starting point, counter, counter increment and end point - once you have these the rest of the loop is just the tasty filling:

-- create the counter, normally a variable

DECLARE @Counter INT =

-- create an end point to stop the loop

DECLARE @EndValue INT =

-- start the loop and set an end point

WHILE @Counter <=>

BEGIN

--Everything else

SET @Counter = @Counter + 1 --Increase the counter

END

Set the initial value of the counter to your year of birth, and loop until this reaches the current year (use year(GetDate())). You can then use the counter within your loop to filter a select statement counting the number of events.

Optionally save this as Going Loopy.sql and close it down.

This page has 0 threads Add post