Erlaubt
<as>
vor Tabellenalias
BigQuery
Db2 (LUW)
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2005
2007
2009
2011
2013
2015
2017
2019
2021
✓ 3.5.7+
✓ 2008R2+
✓ 8.3+
⊘ 11gR1 - 21c
✓ 5.0+
✓ 5.1+
✓ 9.7+
✓ 2.0+