last_value(…) [respect nulls]

BigQueryDb2 (LUW)DerbyH2MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite200720092011201320152017201920212023⚠ 3.25.0 - 3.50.0a⊘ 3.5.7 - 3.23.1✓ 2022+a⚠ 2012 - 2019a⊘ 2008R2⚠ 8.4 - 18a⊘ 8.3✓ 11gR2 - 23.9a⚠ 11gR1a✓ 8.0.11 - 9.4.0⊘ 5.0 - 5.7⚠ 10.2 - 12.0.2a⊘ 5.1 - 10.1✓ 1.4.198 - 2.4.240⊘ 1.4.191 - 1.4.197⊘ 10.15.1.3 - 10.17.1.0⚠ 9.7 - 12.1.2a⚠ 2.0a
  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 9075-2:2023 as part of optional feature T617, “FIRST_VALUE and LAST_VALUE functions”.

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