Concatenate Rows Based on Boolean Values in Another Column with MySQL

To concatenate rows on the basis of boolean value in another column, use GROUP_CONCAT(). Let us first create a table. Here, we have set one of the columns “isValidUser” as BOOLEAN −

mysql> create table DemoTable
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   UserMessage varchar(100),
   isValidUser boolean
);
Query OK, 0 rows affected (0.63 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(UserMessage,isValidUser) values('Hi',true);
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable(UserMessage,isValidUser) values('Hello',false);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable(UserMessage,isValidUser) values('Good',true);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(UserMessage,isValidUser) values('Awesome !!!!!',true);
Query OK, 1 row affected (0.09 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+---------------+-------------+
| Id | UserMessage   | isValidUser |
+----+---------------+-------------+
|  1 | Hi            |           1 |
|  2 | Hello         |           0 |
|  3 | Good          |           1 |
|  4 | Awesome !!!!! |           1 |
+----+---------------+-------------+
4 rows in set (0.03 sec)

Following is the query to concatenate rows on the basis of boolean values in another column. Here, we are concatenating corresponding records for boolean 1 value and same for boolean 0 −

mysql> select isValidUser,group_concat(UserMessage) from DemoTable group by isValidUser;

This will produce the following output −

+-------------+---------------------------+
| isValidUser | group_concat(UserMessage) |
+-------------+---------------------------+
|           0 | Hello                     |
|           1 | Hi,Good,Awesome !!!!!     |
+-------------+---------------------------+
2 rows in set (0.07 sec)