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SQL | Subqueries exercise | Using sub queries to filter with aggregates
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.
You can learn how to do this exercise if you attend one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Subqueries (5 exercises) |
| Level ==> | Relatively easy |
| Courses ==> | Introduction to SQL / Fast-track SQL |
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Write a sub query to filter events to show only those which have an event name of longer than average length. You will need the AVG and LEN functions to do this.
The top 5 results out of 204 events.
You can run your subquery separately by highlighting it to show that the average EventName length is 26 characters:
The advantage of a sub query over typing 26 is that it will stay up to date if the average moves.
Optionally save this exercise as More words, more important.sql, and close it down.