Question

should be easy:
I have two tables:

table 1

  ID  NAME   NEWID   
  1   DOG   
  2   CAT   
  3   HORSE


table 2

NAME   ID
DOG    100
CAT    200
Horse  300

I need the result to be as follows:

 ID  NAME   NEWID   
  1   DOG   100
  2   CAT   200
  3   HORSE 300

My thoughts are:

Update table1
set NewId = (select ID from table2 where Id =NewID)

it says: Invalid column name NewId

Answer 1

Kind of confusing, as it seems you would need to match on name, and not Id? Assuming that is the case:

UPDATE 
   t1 
SET
  t1.NEWID = t2.ID
FROM
  table1 t1
  INNER JOIN table2 AS t2 ON t1.NAME = t2.NAME;