WISE OWL EXERCISES
- Simple Queries (4)
- Setting criteria using WHERE (5)
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- Testing conditions (1)
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- 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 | Show number of events by country, with HAVING
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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 for each country the number of events occurring since 1st January 1990, but only for countries having 5 or more events:
You will need to use a WHERE and a HAVING clause to get these results
Save this query as Recent events, then close it down.
If you still have the time and energy, create another query which shows the number of events for each event name length, with the most common character length (the mode) first:
More events have a name with 32 characters than any other
Save this as Grouped by length and close it down.