SQL | Parameters and return values exercise | Outputting list variables

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Software ==> SQL  (192 exercises)
Version ==> Any version of SQL Server
Topic ==> Parameters and return values  (11 exercises)
Level ==> Average difficulty
Course ==> Advanced SQL
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  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

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The aim of this exercise is to create a stored procedure which will output a variable containing a comma-delimited list of the continents which have 50 or more events. Start by selecting these continents in a stored procedure:

Aggregate Function Procedure

Remember when using aggregates for filtering you will need to use the HAVING clause.

 

Now turn this into a list variable separated using commas, but don't worry about removing the trailing comma. Store this list variable in an output parameter:

SELECT

@OutputParameter = @Outputparameter +

ContinentName + ', '

Execute the stored procedure on a new page and capture the output in a variable, then remove the trailing comma:

LEFT LEN FUNCTIONS

Use the LEN and LEFT functions to remove the trailing comma.

 

Optionally save this as Noisy Continents.sql, and close it down.

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