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 (3)
- Stored procedures (5)
- Variables (8)
- Parameters and return values (11)
- Testing conditions (1)
- Looping (3)
- Scalar functions (6)
- Transactions (4)
- Creating tables (4)
- Temporary tables and table variables (9)
- Table-valued functions (6)
- Derived tables and CTEs (11)
- Dynamic SQL (4)
- Pivots (2)
- Triggers (2)
- Archived (70)
SQL | Aggregation and grouping exercise | Create a query using every SQL key word
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If you haven't already done so, run the script in the above folder to generate the Doctor Who database.
Write a query to list out for each episode year and enemy the number of episodes made, but in addition:
- Only show episodes made by doctors born before 1970; and
- Omit rows where an enemy appeared in only one episode in a particular year.
Your answer should look like this:
The first 3 are probably for Christopher Eccleston, and the last one for Peter Capaldi.
Save this query as SFWGHO (you should know why!), and close it down.