unique nulls [not] distinct
BigQuery
Db2 (LUW)
DuckDB
H2
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2015
2017
2019
2021
2023
⊘ 3.5.7 - 3.51.0
⊘ 2008R2 - 2025
✓ 15 - 18
⊘ 8.3 - 14
⊘ 11gR1 - 23.26.0
⊘ 5.0 - 9.5.0
⊘ 5.1 - 12.1.2
✓ 2.2.220 - 2.4.240
⊘ 1.4.191 - 2.1.214
⊘ 1.0.0 - 1.4.0