Right now I have two entities, let's say Entity A and Entity B.
I want to create a new column in Entity B with the values from an existing column in Entity A (a lookup field?), mapped by a common unique id column that both Entity A and Entity B have.
For example:
If Entity A contains a columnA that has unique IDs, and a columnB that has any random values.
And Entity B contains a columnC that has the same unique IDs as columnA.
I want to create a new columnD in Entity B that is a lookup to columnB from Entity A, using columnA and columnC as the mapping keys.
This seems like a very straightforward thing but I can't figure out how to do it and I could not find any answers online.
In SQL it would be a basic JOIN command to do this but I need to know how to do this on dynamics make.powerapps