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)
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- 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 | Subqueries exercise | List events not in the last 30 countries or the last 15 categories
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You can learn how to do this exercise if you attend the course listed below!
- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- Execute this script.
This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).
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Create a subquery to list out all of those events whose:
- Country id is not in the list of the last 30 country ids in alphabetical order; and
- Category id is not in the list of the last 15 category ids in alphabetical order.
You'll need to use the words NOT IN, as well as TOP N ... DESC.
Your query should list these 8 events (shown here in chronological order):
These events occurred in countries and categories coming early in the alphabet.
Save this query as Early events, then close it down.
Where CountryId NOT IN
Select Top 30 CountryID
Order By CountryName Desc
And CategoryID NOT IN
Select Top 15 CategoryID
Order By CategoryName Desc
INNER JOIN tblEvent
INNER JOIN tblCategory
WHERE tblCountry.CountryID NOT IN
(SELECT TOP 30 tblCountry.CountryID
ORDER BY CountryName DESC)
tblCategory.CategoryID NOT IN
(SELECT TOP 15 tblCategory.CategoryID
ORDER BY tblCategory.CategoryName DESC)
ORDER BY EventName DESC