Self-referencing
merge
BigQuery
Db2 (LUW)
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2007
2009
2011
2013
2015
2017
2019
2021
2023
✓ 2008R2 - 2022
a
✓ 15 - 18
a
✓ 11gR1 - 23.26.0
a
✓ 9.7 - 12.1.2
a
✓ 2.0
a
Syntax accepted, functionality not tested thoroughly