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GROUP_CONCAT
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The GROUP_CONCAT() aggregate function is the MySQL version of the standard SQL LISTAGG function, to concatenate aggregate data into a string. It supports being used with an ORDER BY clause, which uses the expected syntax, unlike LISTAGG(), which uses the WITHIN GROUP syntax.
SELECT group_concat(ID), group_concat(ID ORDER BY ID), group_concat(ID SEPARATOR '; '), group_concat(ID ORDER BY ID SEPARATOR '; '), FROM BOOK
create.select(
groupConcat(BOOK.ID),
groupConcat(BOOK.ID).orderBy(BOOK.ID),
groupConcat(BOOK.ID).separator("; "),
groupConcat(BOOK.ID).orderBy(BOOK.ID).separator("; "))
.from(BOOK).fetch();
Producing:
+--------------+--------------+--------------+--------------+ | group_concat | group_concat | group_concat | group_concat | +--------------+--------------+--------------+--------------+ | 1, 3, 4, 2 | 1, 2, 3, 4 | 1; 3; 4; 2 | 1; 2; 3; 4 | +--------------+--------------+--------------+--------------+
Dialect support
This example using jOOQ:
groupConcat(BOOK.ID)
Translates to the following dialect specific expressions:
-- AURORA_MYSQL, H2, HSQLDB, MARIADB, MEMSQL, MYSQL
group_concat(BOOK.ID SEPARATOR ',')
-- AURORA_POSTGRES, HANA, POSTGRES
string_agg(CAST(BOOK.ID AS varchar), ',')
-- BIGQUERY, COCKROACHDB
string_agg(CAST(BOOK.ID AS string), ',')
-- DB2, EXASOL, REDSHIFT
listagg(BOOK.ID, ',')
-- ORACLE
listagg(BOOK.ID, ',') WITHIN GROUP (ORDER BY NULL)
-- SQLITE
group_concat(BOOK.ID, ',')
-- SQLSERVER
string_agg(CAST(BOOK.ID AS varchar(max)), ',')
-- SYBASE
list(CAST(BOOK.ID AS varchar), ',')
-- TERADATA
substring(xmlserialize(CONTENT xmlagg((',' || CAST(BOOK.ID AS varchar(32000)))) AS varchar(32000)) FROM 2)
-- ACCESS, ASE, DERBY, FIREBIRD, INFORMIX, SNOWFLAKE, SQLDATAWAREHOUSE, VERTICA, YUGABYTEDB
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.18, see #10141), or translate your own on our website
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