Exercise: Creating tables

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

Category ==> SQL  (115 exercises)
Topic ==> Creating tables  (3 exercises)
Level ==> Harder than average
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 books and authors.

Write code to generate a table of genres of author called tblGenre (you may already have done this in the previous exercise):

SQL exercise - Creating tables (image 1)

Suggested genres to type in - feel free to use your own!

Now modify your code so that it also creates a column called GenreId in the tblAuthor table (first checking that it doesn't already exist, and deleting it if it does).  Here is the code to do this:

SQL exercise - Creating tables (image 2)

This extra titbit isn't in the courseware manual

Now add to your query to make it:

  • Create a foreign key constraint on this added column (linked to the GenreId column in the tblGenre table)
  • Update the authors so that they belong to the correct genre, using 3 UPDATE statements (one per author)
  • Use a SELECT statement to display each author with their corresponding genre, joining the tblAuthor and tblGenre tables

Here's what the final SELECT statement should show:

SQL exercise - Creating tables (image 3)

Your categorisation may be different, of course

Now for the hardest part - make sure that your query works every time that you run it, and not just the first time!

Optionally, save this query or procedure as Genres linked to authors.sql, then close it down.

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