Hello, I'm trying to create a class using the class item "gst." The attribute in the database can only have three values (2000, 2100, and <NULL>). Unfortunately, I can't create the NULL EXPRESSION.
I've already tried the following: EXPRESSION IS NULL EXPRESSION "<NULL>" EXPRESSION <NULL> EXPRESSION EMPTY What is the correct syntax for this? ________________________________ Monatlich aktuelle Informationen Ihrer Stadtverwaltung in unserem Newsletter! Newsletter Anmeldung<https://www.stadt-koeln.de/service/onlinedienste/newsletter-anmeldung?para=allgemein> ________________________________ [https://www.stadt-koeln.de/images/footer-final4-2025.jpg]<https://www.stadt-koeln.de/leben-in-koeln/freizeit-natur-sport/veranstaltungskalender/lidl-final4-dhb-pokal>
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