… as (…) virtual
BigQuery
Db2 (LUW)
Derby
H2
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2007
2009
2011
2013
2015
2017
2019
2021
2023
✓ 3.31.0 - 3.50.0
⊘ 2008R2 - 2022
⊘ 12 - 17
✓ 11gR1 - 23.9
✓ 5.7 - 9.4.0
✓ 5.2 - 12.0.2
⊘ 1.4.191 - 2.3.232
⊘ 10.15.1.3 - 10.17.1.0
⚠ 9.7 - 12.1.2
a
Accepted in a few cases, but suspected to be a parser oddity — use with caution!