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 | Archived exercise | Count how many people by status - vbls
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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.
The tblPersonStatus table contains two rows as follows:
A person is either current or obsolete!
By linking the tblPerson table to this tblPersonStatus table, create a simple query to show the number of people who still work at their companies:
A suggestion for what the query could look like
By declaring and using two variables (called @NumberCurrent and @NumberObsolete, perhaps?) create a query to show how many people there are in the database for each of the two statuses (stati?) Current and Obsolete:
What the result of running your query should look like
Optionally, save this query as Count persons by status.sql, then close it down.