window … as (<existing window name> …)


BigQueryDb2 (LUW)DerbyH2MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite20092011201320152017201920212023✓ 3.28.0 - 3.50.0⊘ 3.5.7 - 3.26.0⊘ 2008R2 - 2022✓ 8.4 - 17⊘ 8.3⊘ 11gR1 - 23.9✓ 8.0.11 - 9.3.0⊘ 5.0 - 5.7✓ 10.2 - 12.0.2⊘ 5.1 - 10.1⊘ 1.4.191 - 2.3.232⊘ 10.15.1.3 - 10.17.1.0⊘ 9.7 - 12.1.2⊘ 2.0

Definitions in the window clause can inherit declarations from previous window names of the same clause.

 SELECT COUNT(*) OVER tenant
      , SUM(x) OVER past
   FROM …
 WINDOW tenant AS (PARTITION BY …)
      , past AS (tenant ORDER BY …) 

The window name past inherits the partition by clause from tenant.

Normative References

The window clause, including the ability to refer to existing window names, is defined in ISO/IEC 9075-2:2023 as part of optional feature T612, “Advanced OLAP operations”.

You can’t catch up on 20 years of SQL evolution in one day. Subscribe the newsletter via E-Mail, Bluesky or RSS to gradually catch up and to keep modern-⁠sql.com on your radar.

About the Author

Photo of Markus Winand

Markus Winand provides insights into SQL and shows how different systems support it at modern-sql.com. Previously he made use-the-index-luke.com, which is still actively maintained. Markus can be hired as trainer, speaker and consultant via winand.at.

Buy the Book

Cover of “SQL Performance Explained”: Squirrel running on grass

The essence of SQL tuning in 200 pages

Buy now!
(paperback and/or PDF)

Paperback also available at Amazon.com.

Hire Markus

Markus offers SQL training and consulting for developers working at companies of all sizes.
Learn more »

Connect with Markus Winand

Subscribe mailinglistsSubscribe the RSS feedMarkus Winand on LinkedInMarkus Winand on XINGMarkus Winand on TwitterMarkus Winand on Bluesky
Copyright 2015-2025 Markus Winand. All righs reserved.
Legal | Contact | NO WARRANTY | Trademarks | Privacy and GDPR