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BigQuery
Db2 (LUW)
MariaDB
MySQL
Oracle DB
PostgreSQL
SQL Server
SQLite
2005
2007
2009
2011
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2019
2021
2023
✓ 3.44.0 - 3.47.0
a
✓ 3.5.7 - 3.43.0
✓ 2012 - 2022
a
✓ 2008R2
✓ 9.1 - 17
a
✓ 8.4 - 9.0
⚠ 8.3
⚠ 23aiFREE
b
⚠ 11gR1 - 23cFREE
a
✓ 5.0 - 9.1
✓ 5.1 - 11.6
✓ 9.7 - 11.5.9
✓ 2.0
concat()
treats
null
as empty string
Empty string
is null
.
||
treats
null
as empty string.