I've been trying to search for a solution for this to no avail.

I have a value relation set up and want another field connected and relative to this.

Example: Field 1 (Value 1) Field 2 (Value 2)

Value 1.1 = Value 2.1 Value 1.2 = Value 2.2 And so on.

So if i add Value 1.1 to field 1 i want it to automatically add Value 2.1 to field 2.

Field 2 does not need to be editable so it only needs to go one way so to speak.

Is there a solution for this?

EDIT: Clarification what i want to do. The actual values i want to use are tree species names. If "Acer platanoides" is added to field 1 i want "Maple" in field 2. I have a value relation set up with the species name but want the common name to be added automatically as well. Preferably in a separate field.

  • Could you please edit your question with the software you are using?
    – gHupf
    Apr 26, 2023 at 11:40
  • Of course, sorry about that! Done!
    – Niklas
    Apr 27, 2023 at 5:21
  • Your question lacks details, but it sounds like you could make use of a virtual field
    – Matt
    Apr 27, 2023 at 5:53
  • Are Field 1 & Field 2 numeric fields? Otherwise, @Cushen's proposed code for the virtual field won't work.
    – jpinilla
    Apr 27, 2023 at 10:47
  • No, the fields are not numeric values im afraid. I chose to use value wording because i thought it would make it more understandable, but maybe i just made it confusing. I will update my question with clarification!
    – Niklas
    Apr 28, 2023 at 6:50

1 Answer 1


We can use a Virtual Field to do this. Create Field 2 as a virtual field and with an expression.
In the 'Maple' example above we want to turn a string into another based on the Field1 value. For this we can use a CASE Expression such as:

WHEN "FIELD1" = 'Acer platanoides' THEN 'Maple'
WHEN "FIELD1" = 'Quercus alba' THEN 'White Oak'

As values are added or edited to Field1 Field2 will update once a save is made. We can add as many WHEN checks to the CASE as we need.

In my example below Field1 has the name 'HubDist' & we are dealing with numbers not strings

example image

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