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 | Derived tables and CTEs exercise | Using a simple CTE to filter data
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend one of more of the courses listed below!
- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- Execute this script.
This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).
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The aim of this exercise is to use a CTE to hold some data, before joining another table to your CTE. Start by selecting only events which start with a letter between A and M.
This should return 300 rows - including the CategoryID column will allow us to join this CTE to the tblCategory table.
Now turn this SELECT statement into a CTE called First_Half_CTE. The layout will be something like this:
--Select goes here
Now extend your query to join the tblCategory table to the CTE in the same way as you would join a normal table:
This should return 300 categories (scroll down to see more cheerful events).
Optionally save this as Passing my CTE.sql and close it down