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Concatenate some of the column values in a single line with MySQL and prefix a particular string “MR.” to every string
The CONCAT() method would be used to concatenate “MR” to every string, whereas GROUP_CONCAT() to concatenate some of the column values in a single line.
Let us first see an example and create a table −
mysql> create table DemoTable799( UserId int, UserName varchar(100), UserAge int ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable799 values(101,'John',21); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable799 values(102,'Chris',26); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable799 values(101,'Robert',23); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable799 values(103,'David',24); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable799 values(101,'Mike',29); Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable799;
This will produce the following output −
+--------+----------+---------+ | UserId | UserName | UserAge | +--------+----------+---------+ | 101 | John | 21 | | 102 | Chris | 26 | | 101 | Robert | 23 | | 103 | David | 24 | | 101 | Mike | 29 | +--------+----------+---------+ 5 rows in set (0.00 sec)
Here is the query to concatenate strings −
mysql> select UserId,GROUP_CONCAT(CONCAT('MR.', UserName)) from DemoTable799 group by UserId;This will produce the following output −
+--------+---------------------------------------+
| UserId | GROUP_CONCAT(CONCAT('MR.', UserName)) |
+--------+---------------------------------------+
| 101 | MR.John,MR.Robert,MR.Mike |
| 102 | MR.Chris |
| 103 | MR.David |
+--------+---------------------------------------+
3 rows in set (0.00 sec)
Updated on: 26-Aug-2019
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