I have many columns, about 30 and each of those has some attributes. I want to merge those columns to one and collect all attributes in a row of columns. I tried with this post but it is not for I am looking for. Combining Columns QGIS Attribute Table I have an example in ms excel what I want that without commas and spaces. Attributes have to be separated with one comma.
With this script, if some fields are empty, I have got null fields. Sorry for my English