I have translated the database into English: to get the database working.
A database is ready for download via (Dropbox) goo.gl/KI3aQs
@plog: To be more specific the totaalbedrag means; the total sales amount per ordernumber (bestelnr)
@sneuberg/@jdraw:
Good advise; Dsum and to remove...
Thx. Follow the advise.
Now i need to know how i automate the price when the ordertabel is submited, insted off manual input.
This are my tabels and relationships.
What do i change in the database to make this work?