Search notes:

LISTAGG (SQL standard feature T625)

listagg allows to concatenate strings in an select statement with a group-by clause.

Various vendors implemented listagg with differing names.

Mansas Kumar has provided a very nice comparison of the implementation of listagg for various database vendors in this Stackoverflow answer. The gist of the answer is:

Vendor	function
Oracle	`listagg`
DB2	`listagg`
SQL Server (>= 2017)	`string_agg`
PostgreSQL	`string_agg`
SQLite	`group_concat`
MySQL	`group_concat`

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/misc/ISO...', 1740442865, '18.191.33.20', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/misc/ISO/9075/features/T625(56): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

LISTAGG (SQL standard feature T625)

See also