Joe Pluta wrote:
Hi David!And not to be contrary, but by far the easiest way to do this would be to read the file sequentially by key and compare the key to the previous key plus one. If it doesn't match, previous key plus one is your answer. Start previous key at zero.
The easiest way to do this is to look at every key in the file and find one where the next key doesn't exist. To do that, create a temporary table with a list of next keys (potential holes). If your lowest key may not be in the file, you have to include that manually in your list of potential keys.
So just break it down by task:
// Create list of potential holes as every key in the file +1
With T1 as // Include 1 by using the system dummy file
(select 1 as potential from sysibm/sysdummy1 union all
select keyfield+1 as potential from keys)
// Now select the smallest one without a match select min(potential) from t1 where not exists (select 1 from keys where potential = keyfield)
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