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 | Temp table with update statements
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You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
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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.
Create a query to show a list of all of the people in the database in first name order, showing for each:
- Their id and name
- The number of course places they have booked in total
- The number of SQL course places they have booked; and
- The number of Visio course places they have booked
The final output of the query should be something like this:
The first few rows of the final table produced by the query
There are many ways you can do this, but here's a suggestion (which is the method used by the answer):
- Create a temporary table with the columns shown above
- Use an INSERT INTO statement to fill it with all of the rows from the tblPerson table (at this stage the last 3 columns will be null)
- Use an UPDATE statement to set the value of the NumberPlaces column
- Use another UPDATE statement to set the value of the NumberSql column
- Finally, use yet another UPDATE statement to set the value of the NumberVisio column
This method is without doubt not the fastest-executing one you could choose - but it is nice and easy to read!
Optionally, save this query as People facts.sql, then close it down.