WISE OWL EXERCISES
- Simple Queries (4)
- Setting criteria using WHERE (5)
- Calculations (7)
- Calculations using dates (4)
- Basic joins (8)
- More exotic joins (2)
- Aggregation and grouping (8)
- Views (5)
- Subqueries (5)
- Stored procedures (5)
- Variables (8)
- Parameters and return values (11)
- Testing conditions (1)
- Looping (3)
- Scalar functions (6)
- Transactions (5)
- Creating tables (5)
- Temporary tables and table variables (9)
- Table-valued functions (6)
- Derived tables and CTEs (13)
- Dynamic SQL (4)
- Pivots (2)
- Triggers (2)
- Archived (70)
SQL | Archived exercise | Fn to find domain name using reverse, charindex
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend the relevant Wise Owl course (sadly, only in the UK for now).
You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.
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.