I have this: ID Num 1 KP2 2 KP3 3 KP2 4 KP3 5

Question

Asked: May 26, 20262026-05-26T02:29:51+00:00 2026-05-26T02:29:51+00:00

I have this:

ID    Num
1     KP2
2     KP3
3     KP2
4     KP3
5     KP3

I need to get this:

I tried this:

  UPDATE t
  SET ID = t2.ID
  FROM table t JOIN table t2 ON t.Num = t2.Num

This does not work though. Nothing is changes It says that rows were updated, but IDS are still the same.

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Editorial Team · Answer 1 · 2026-05-26T02:29:51+00:00

Editorial Team

How about this:

UPDATE t
SET ID = (SELECT MIN(ID) FROM t AS t2 WHERE t.Num = t2.Num)

Having said that, the name “ID” sort of suggests primary key. Are you sure this is what you want?

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