Unique
Apache Derby
BigQuery
Db2 (LUW)
H2
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2007
2009
2011
2013
2015
2017
2019
2021
⚠ 3.31.0 - 3.42.0
a
✓ 2008R2+
✓ 12+
✓ 11gR1+
✓ 5.7+
✓ 10.2+
⚠ 5.2 - 10.1
✓ 1.4.191+
✓ 9.7+
✓ 10.15.1.3+
Only without explicit data type:
col_name
integer
generated always as …