Unique tool: At least one unique field must be selected

Question

Hi,

I'm experiencing the following issue when using unique tool. It says: "At least one unique field must be selected". But the issue for me is that in the settings window, no columns are displayed for me to choose from:

Before the unique tool, I have a join, which is based on 2 fields, but both are with matched types on right and on left:

Could someone advise what might be the issue?

cjaneczko · Answer

There is probably an issue with the Join tool. Verify that the data types are the same coming into the join and that you actually do have matches between the two data sets. Also make sure you have selected which fields you want to output from the Left and Right joins. You should see columns in the Unique tool once data is flowing out of the Join tool.

yanatodorova26 · Answer

@cjaneczko hmm not actually :/

cjaneczko · Answer

If you click on the J output anchor on the Join tool, are you seeing Data in the Results preview?