Question : New unique values for field

I have a table named `mytable` with a field called `record_numb`

Now there are some duplicate values for `record_numb`

I want to give all 10,000 records a new unique `record_numb`

The `record_numb` must be unique!

Answer : New unique values for field

then

update yourtable set  record_numb = tmpid;