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BigQueryDb2 (LUW)MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite2005200720092011201320152017201920212023✓ 3.44.0 - 3.47.0a✓ 3.5.7 - 3.43.0✓ 2012 - 2022a✓ 2008R2✓ 9.1 - 17a✓ 8.4 - 9.0⚠ 8.3⚠ 23aiFREEb⚠ 11gR1 - 23cFREEa✓ 5.0 - 9.1✓ 5.1 - 11.6✓ 9.7 - 11.5.9✓ 2.0
  1. concat() treats null as empty string
  2. Empty string is null. || treats null as empty string.