Everyone.I have a problem about data source.
Please see the attachment 1.png and 2.png.
1.png tells us how to connect to a database,and get a .qvd file.
2.png tells us the problem happans when using the .qvd file.
Could anyone tell me why "??" happens?
I have never seen this before. Below thread might be useful.
Multiple Question mark in list box | Qlik Community
Retrieving data ...