Question

I need to bring values together and copy it to a diffrent column.

COLUMN 1 | COLUMN 2 |  COLUMN 3 | COLUMN 4 
Hallo      out         there      Hallo out there
My         NULL        name is    My name is
I'm        a           rabbit     I'm a rabbit

How to merge column 1, 2, 3 and copy it to column4 separated with space.

Columns can be null.

Answer 1

UPDATE dbo.table
  SET column4 = COALESCE(column1, '') 
      + COALESCE(' ' + column2, '')
      + COALESCE(' ' + column3, '');