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 | Archived exercise | Use CTE to list important people courses
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If you haven't already done so, run the stored procedure in the above folder to generate a database of training courses and delegates.
Here are the tables that you will need to do the first part of this exercise:
Initially we only need to show the people having a delegate count of 6 or more
Create a query to show the ids of the people who have attended 6 or more courses:
There are only 3 people
Now turn this into a longer query to show the course names that these people have attended, using a CTE (common table expression) (you'll need to join your CTE to the tblDelegate, tblSchedule and tblCourse tables to accomplish this):
The first few of the 18 rows your query should return
Optionally, save this query as Important people courses, then close it down.