Indtast parameterværdi i en forespørgsel

Du kan altid angive en parameterværdi ved at indtaste et udtryk i kantede parenteser i Kriterie-feltet:
F.eks.
[Indtast værdi]

Dialogen kommer når du enten, som thomas jepsen siger, selv indtaster kantede parenteser i for at angive kriterier - ELLER - fordi du har indtastet et udtryk Acces ikke kender fx. Total = Sum. Kontrollér at du kun angiver udtryk Acces kan fortolke - så kan du undertrykke prompt'en ...

just an addition to parameters, which I dont think is used so often but in fact is a good idea if you want Access to check that the entered value has the correct data type.
Right click on the area where the tables are and then choose parameters from the menu.
Now you enter the text you want to use for the paramater, for example Indtast værdi (without []) and then choose the data type, for example date/time.
Now in your query you enter [Indtast værdi] (now with []). If you enter an invalid data type Access will prompt you to change it.

If you look at the SQL to the query you will see that an extra line has been added.
PARAMETERS [Indtast værdi] DateTime;