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 | Dynamic SQL exercise | Use dynamic SQL to create a procedure with varying sort order
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First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.
Create a procedure called spEpisodesSorted which takes two parameters:
|Parameter||What it does||Default value|
|@SortColumn||The name of the column to sort by||EpisodeId|
|@SortOrder||The order to sort by (ASC or DESC)||ASC|
Declare and build up a string variable called @sql which contains a SELECT command based on the value of these two parameters, and execute it like this:
-- run command contained in variable
You should now be able to list the Doctor Who episodes in different orders! For example:
-- show episodes in default order
-- show episodes in reverse title order
spEpisodesSorted 'Title', 'DESC'
When you've got this working, optionally save the query as Allsorts.sql, then close it down.