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 | Derived tables and CTEs exercise | Solve a complex question using CTEs and/or subqueries
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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.