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Concatenate rows on the basis of 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)
Updated on: 25-Sep-2019
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