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How to merge rows in MySQL?
To merge rows in MySQL, use GROUP_CONCAT().
Let us first create a table−
mysql> create table DemoTable734 ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.73 sec)
Insert some records in the table using insert command−
mysql> insert into DemoTable734 values(101,'John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable734 values(102,'John'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable734 values(103,'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable734 values(104,'Chris'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable734 values(104,'Chris'); Query OK, 1 row affected (0.13 sec)
Display all records from the table using select statement−
mysql> select *from DemoTable734;
This will produce the following output -
+------+-------+ | Id | Name | +------+-------+ | 101 | John | | 102 | John | | 103 | Chris | | 104 | Chris | | 104 | Chris | +------+-------+ 5 rows in set (0.00 sec)
Following is the query to merge rows−
mysql> select Name,group_concat(Distinct Id SEPARATOR ',') from DemoTable734 group by Name;
This will produce the following output -
+-------+-----------------------------------------+ | Name | group_concat(Distinct Id SEPARATOR ',') | +-------+-----------------------------------------+ | Chris | 103,104 | | John | 101,102 | +-------+-----------------------------------------+ 2 rows in set (0.04 sec)
Updated on: 22-Aug-2019
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