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Restricting groups

Earlier you created an overview of how many eSymphony customers live in each country. The output was a long list. Now, you want to restrict your results and only display countries with more than four customers. Since you grouped your output by country, you will now need to exclude values on a group-level rather than a row-level.

说明

100 XP

Run the query. Note that it throws an error.
Adapt the query to show countries with more than four customers.

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