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SQL | Archived exercise | Turning null continent ids into values
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You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
Software ==> | SQL (198 exercises) |
Version ==> | Any version of SQL Server |
Topic ==> | Archived (70 exercises) |
Level ==> | Relatively easy |
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If you haven't already got it set up in SQL server, restore the Historical Events database from the above folder.
Create a query to show a list of the countries in the tblCountry table in reverse alphabetical order. Where a country has no continent id, replace this with 0:

Listed in reverse alphabetical order, the World appears first
Save this query as Denullification, and close it down.