over(… rows between …)

The over accepts rows framing, which limits the scope of the window functions to the rows between the specified range of rows relative to the current row.

SELECT *, COUNT(*) OVER(ORDER BY c1
                         ROWS BETWEEN UNBOUNDED PRECEDING
                                  AND CURRENT ROW)
  FROM …

Returns an additional column with row count of the rows between the beginning of the result set and the current row—like row_number().

Meaningful framing requires an order by clause in over as well. Note that this order by clause does not necessarily affect the order of rows in the final result. If you want the result in a specific order, add an order by clause at the outermost query level.

Related

• Sub clauses:

  • over(partition by …)

  • over(order by …)

  • Framing:

    • over(… range between …) (numeric), over(… range between …) (datetime)

    • over(… groups between …)

    • Frame exclusion:

      • over(… exclude no others)

      • over(… exclude current row)

      • over(… exclude group)

      • over(… exclude ties)

• Product specific extensions: over(range between…) (strings, multi-columns)

Normative References

The over clause, including rows between, is defined in ISO/IEC 9075-2:2023 as part of optional feature T611, “Elementary OLAP operations”.