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MySQL query to concatenate records with similar corresponding ids in a single row separated by a special character
For this, you can use CONCAT_WS() along with GROUP_CONCAT(). Let us first create a
mysql> create table DemoTable2016 -> ( -> UserId int, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.51 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2016 values(1,'Chris'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable2016 values(2,'Bob'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable2016 values(1,'David'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2016 values(2,'Carol'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2016 values(1,'Sam'); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2016;
This will produce the following output −
+--------+----------+ | UserId | UserName | +--------+----------+ | 1 | Chris | | 2 | Bob | | 1 | David | | 2 | Carol | | 1 | Sam | +--------+----------+ 5 rows in set (0.00 sec)
Here is the query to concatenate records in a row separated by a special character −
mysql> select group_concat(concat_ws('-',UserName,UserId)) from DemoTable2016 group by UserId;
This will produce the following output −
+----------------------------------------------+ | group_concat(concat_ws('-',UserName,UserId)) | +----------------------------------------------+ | Chris-1,David-1,Sam-1 | | Bob-2,Carol-2 | +----------------------------------------------+ 2 rows in set (0.00 sec)
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