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When I make a selection in the query in Mapserver I got a blank page.

The query I use is: DATA "geom from (select * from bagmutlijst_201210.vo_gepland_gemeente where gemcode = '0141') as selection using unique gemcode using srid=28992"

The data is correct because if you use the following query (without a selection) I got a correct map. DATA 'geom from bagmutlijst_201210.vo_gepland_gemeente using unique gemcode using srid=28992'

Why is the selection not working?

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There wan't anything wrong with the query, but what the mapserver request I did. The polygon I selected was outside the BBOX.

When I changed the BBOX the polygon was visible.

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