SQL | Creating tables exercise | Insert INTO a new table of aggregated data

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Software ==> SQL  (192 exercises)
Version ==> Any version of SQL Server
Topic ==> Creating tables  (4 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).

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The aim of this exercise is to create a new summary table listing all the continents. Write a SELECT statement which returns the following summary data for each continent. 

Summary of aggregated data in table

Use COUNT, MIN and MAX to get the above output (see below).

To get the number of countries, for example, you could use DISTINCT:

SELECT

ContinentName

,Count(DISTINCT(CO.CountryID)) AS [Countries in Continent]

To turn this into a table, use the INTO command just above the FROM keyword, followed by the name Continent_Summary.

Run your revised query, then look in Object Explorer to check the new table exists:

Created aggregate table of data

If the table doesn't appear, try refreshing the tables folder.

 

Run your query again - it should crash, because the table already exists. 

Add a command to delete the Continent_Summary table if it exists at the beginning of your query, so that each time you run the query it will recreate a new copy of the table.

Optionally save this as Continental Counting.sql, and close it down.

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