select without from

BigQueryDb2 (LUW)MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite200520072009201120132015201720192021✓ 3.5.7+a✓ 2008R2+a✓ 8.3+a⊘ 11gR1 - 21c✓ 5.0+a✓ 5.1+a⊘ 9.7 - 11.5.7✓ 2.0+a
  1. Proprietary extension (non-standard!)