I want to add only a few specific columns from the join table but there is no drop down list. When selecting manually I'm able to select only 1 column when trying more than 1 I'm not getting the desired results.
I have tried writing like
1] column1, column2
2] 'column1', 'column2'
3] "column1", "column2"
4] (column1), (column2)
5] (column1, column2)
But none of them works. Please help how I can add only few selected columns
PS: the drop down option is available in join attributes by field tool when I try to use it without the processing modeler