Question

I have researched everywhere but still can’t seem to fix a simple error:
Running Microsoft SQL server:

UPDATE copyprogmaster
       SET active =
                 CASE
                   WHEN active = 1 THEN active = 0
                   WHEN active = 0 THEN active = 1
                  ELSE active
                 END
WHERE source = 'Mass_Mail'

my error is :

Line 4: Incorrect syntax near ‘=’.

Answer 1

Remove the = after the THEN, so:

  UPDATE copyprogmaster
       SET active =
                 CASE
                   WHEN active = 1 THEN 0
                   WHEN active = 0 THEN 1
                  ELSE active
                 END
  WHERE source = 'Mass_Mail'

You already have active = after the SET on the second line.