dive into mark

Here’s an Oracle version of the same query:

select data.*
, derived_table.position
from data
, (select a.id, sum(nvl(b.length, 0)) position
   from data a
   , data b
   where b.id(+) < a.id
   group by a.id
) derived_table
where data.id = derived_table.id

Oracle uses NVL instead of COALESCE, and its own join syntax instead of ANSI-92 joins, but the concepts are the same.

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