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SQL | Creating tables exercise | Creating tables
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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):
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:
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:
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.