Every school unit in Sweden has a unique school unit code (skolenhetskod, 8 digits) in the school unit register. The code is used to link statistics from different data sources to the correct school.
Use
The school unit code is the key that makes it possible to combine data from the National Agency for Education's grade statistics, staffing statistics, the School Survey, and other sources. Skolkoll uses the school unit code to match data to each school page.