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SQL | Scalar functions exercise | Create a scalar function to count the total number of letters
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You can learn how to do this exercise 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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Create a function called fnLetterCount which takes two parameters:
|Parameter||What it should contain|
|@First||The name of an event|
|@Second||The details for an event|
Your function should sum:
- The length in letters of the event name (using the LEN function); and
- The length in letters of the event details column (again using LEN).
Your function should then return this value as an integer. As a reminder, here's the syntax of a basic function:
CREATE FUNCTION NameOfFunction(
Test that your function works by running a query like this:
-- this should return the number 7 (4 + 3)
AS 'Number of letters'
Incorporate this function within a query to list out events in order of the total number of characters used, with the shortest first:
The first few events this query should return.
Optionally, save this as Pointless statistic.sql, then close it down.