WISE OWL EXERCISES
SQL EXERCISES
SQL 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 | Derived tables and CTEs exercise | Solve a complex question using CTEs and/or subqueries
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 one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Derived tables and CTEs (13 exercises) |
| Level ==> | Harder than average |
| Courses ==> | Introduction to SQL / Fast-track SQL / Advanced SQL |
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First run the script shown above to generate the Doctor Who training database.
Create a query which lists the David Tennant episodes for which none of the enemies appear in any non-David Tennant episodes:
The first few of the 31 David Tennant episodes which don't share any enemies with any other non-Tennant episodes.
There are probably hundreds of ways to do this in SQL, and the answer given doesn't claim to use a particularly efficient one.
Optionally, save this query as Tennant only, then close it down.