Foreign key to another table
BigQuery
Db2 (LUW)
DuckDB
H2
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2007
2009
2011
2013
2015
2017
2019
2021
2023
2025
⚠ 3.31.0 - 3.51.0
d
⊘ 2008R2 - 2025
⚠ 18
b
✓ 12 - 17
✓ 11gR1 - 23.26.0
⚠ 9.0 - 9.5.0
a
⚡ 5.7 - 8.4
a
b
⚠ 10.5 - 12.1.2
a
⚡ 10.2 - 10.4
c
⚡ 10.0.10 - 10.1
a
⚡ 5.2 - 5.5.23
✓ 1.4.191 - 2.4.240
⊘ 1.0.0 - 1.4.0
✓ 9.7 - 12.1.2
Foreign keys in the column definition are
parsed but ignored
Only with storage option
stored
As table constraint, not inside the column definition
Only without explicit data type:
col_name
integer
generated always as …