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:

-- CUBRID, H2, HSQLDB, MARIADB, MYSQL
group_concat(BOOK.ID SEPARATOR ',')

-- DB2
listagg(BOOK.ID, ',')

-- ORACLE
listagg(BOOK.ID, ',') WITHIN GROUP (ORDER BY NULL)

-- POSTGRES
string_agg(CAST(BOOK.ID AS varchar), ',')

-- SQLITE
group_concat(BOOK.ID, ',')

-- SYBASE
list(CAST(BOOK.ID AS varchar), ',')

-- ACCESS, ASE, AURORA_MYSQL, AURORA_POSTGRES, BIGQUERY, COCKROACHDB, DERBY, EXASOL, FIREBIRD, HANA, IGNITE, INFORMIX, MEMSQL, 
-- REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE, SQLSERVER, TERADATA, VERTICA
/* UNSUPPORTED */

(These are currently generated with jOOQ 3.15, see #10141)

The jOOQ User Manual : SQL building : Column expressions : Aggregate functions : GROUP_CONCAT

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