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 | Basic joins exercise | Create multiple joins to show the shortest Doctor Who episodes
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If you haven't already done so, run the script in the above folder to generate the Doctor Who database.
Create a query to list out the appearances of enemies in episodes which have length under 40 characters, where the length is defined as the sum of:
- the number of characters in the author's name;
- the number of characters in the episode's title;
- the number of characters in the doctor's name; and
- the number of characters in the enemy's name.
This should reveal two episodes:
The two episodes which make it under the very low bar.
You are now a master (or mistress) of joins! Save this as Time for a coffee, then close it down.