Can I use… last_value(…) [respect nulls]


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  1. No explicit respect nulls clause

The last_value(…) window function evaluates its argument using the last row defined by the over clause:

SELECT LAST_VALUE(<expr>) OVER (ORDER BY …)
  FROM …

Default Framing Applies

If there is no explicit framing clause the following default applies:

RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW

That means, the last_value() function cannot see beyond the ties to the current row. Open the frame to bring the last row into reach:

ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING

Normative References

The last_value() window function is defined in ISO/IEC 9075:2016-2 as part of optional feature T617, “FIRST_VALUE and LAST_VALUE functions”.

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