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Check if the column values are the same among multiple records and set these records in a single row separated by a special character in MySQL
For this, you can use GROUP_CONCAT() along with DISTINCT. Let us first create a table −
mysql> create table DemoTable ( Id int, Subject varchar(40) ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(100,'MySQL'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(100,'MongoDB'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(100,'Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100,'MongoDB'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(101,'MySQL'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(101,'MySQL'); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------+---------+ | Id | Subject | +------+---------+ | 100 | MySQL | | 100 | MongoDB | | 100 | Java | | 100 | MongoDB | | 101 | MySQL | | 101 | MySQL | +------+---------+ 6 rows in set (0.00 sec)
Following is the query to check if the column values are the same among multiple records and set these records in a single row separated by a special character. The separator here is hyphen −
mysql> select Id,group_concat(distinct Subject separator '-') as Subject from DemoTable group by Id;
This will produce the following output −
+------+--------------------+ | Id | Subject | +------+--------------------+ | 100 | Java-MongoDB-MySQL | | 101 | MySQL | +------+--------------------+ 2 rows in set (0.04 sec)
Updated on: 04-Oct-2019
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