Unique gapless ID:s from system - how to? - response (1) by dnoeth

The only way to get a gapless sequence is to do it on your own with ROW_NUMBER like

select 
   row_number() over (order by whatever) 
   + coalesce((select min(seq) from tab), 0) as seq
....
from tab 

Instead of "select min(seq) from tab" you might have an extra table storing with the current max value for this table and then you increase it by the activity_count (probably using a SP).
 
Dieter