How to merge rows in OpenRefine

Question

How to merge rows based on some ID field?

Original Table                   New Table

ID   | Field1 | Field2       ID     | Field1 | Field2
-----|------- |------         


        

Answer 1

For "ID" column use "add column based on this column":

filter(
  cell.cross("ProjectName", "ID").cells["Field1"].value,
  v,
  isNonBlank(v)
)[0]

This will set a value for each row identified ID.

Original Table      New Table

ID   | Field1 | Field2 | Field1_ | Field2_
-----|------- |--------|---------|--------
A        5                  5        10
A                10         5        10
B        1                  1        3
B                3          1        3
C        4                  4        150
C                150        4        150

Remove old columns.

After that, remove duplicates by using "blank down + facet by blank + remove matching rows" approach