ALL SOFTWARE EXERCISES
- EXERCISES HOME PAGE (881)
- Access 2010 (66)
- Access VBA Macros (17)
- Advanced VBA (29)
- Excel 2010 (83)
- Excel 2013 (10)
- Excel 2016 (0)
- Excel VBA Macros (37)
- Power BI - Excel 2013 (25)
- Power BI - Excel 2016 (23)
- Power BI Desktop (26)
- PowerPivot 2010 (26)
- Report Builder 3.0 (42)
- SQL (192)
- SSAS - multidimensional (21)
- SSAS - tabular (29)
- SSIS Integration Services (40)
- SSRS 2016 (32)
- SSRS Reporting Services (53)
- Visual Basic (45)
- Visual C Sharp (65)
- WPF - Visual C# (20)
- 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)
Exercise: Use a CTE to show events containing this and that
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).
You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.
This exercise shows how you can use a CTE to make a complicated question simple, by dividing it into two or more parts.
First create a query to list out for each event id the positions (if any) of the words this and that:
The first few events in the list - the last two columns give the position (if any) at which the words this and that can be found.
As an example, CHARINDEX('too','This too shall pass',1) would return 6, since the word too starts at the 6th letter of the given text (if you begin counting at the 1st character).
Now using this as a CTE, show the two events which contain both words in the right order (ie this followed by that). You'll need to join your CTE to the events table, so that you can pick up on the event name and event date, and display them.
The EventDetails column for these two events contains the words this and that, in this order.
Here's the sort of thing you'd have had to write without a CTE (showing how useful CTEs are!):
CHARINDEX('this',e.EventDetails,1) AS ThisPosition,
CHARINDEX('that',e.EventDetails,1) AS ThatPosition
FROM tblEvent AS e
-- must contain both strings ...
CHARINDEX('this',e.EventDetails,1) > 0 and
CHARINDEX('that',e.EventDetails,1) > 0 and
-- ... in the right order
Save your query as This and that revisited, and close it down.