WISE OWL EXERCISES
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SQL | Archived exercise | Fn to find domain name using reverse, charindex
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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).
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If you haven't already done so, run the stored procedure in the above folder to generate a database of the world's leading websites. This exercise refers to the following two tables from this database:
Each country's domain (eg .UK) can have lots of corresponding websites
Create a function to return the domain suffix from any website URL (eg the Wise Owl website URL would return .uk).
You may find it easier to use the reverse function to reverse the order of the URL, then use the charindex function to find the first full stop. Don't forget to check for errors - if charindex returns 0, then this isn't a valid URL!
Use your function to show all websites where the domain reported by the DomainId column isn't the same as the actual domain suffix:
Your query should show 7 sanitised adult sites and one Mexican mistake!
Optionally, save the code to generate this function as Return country domain.sql, then close it down.