MySQL query to update string field by concatenating to it?

For concatenating a string field, use CONCAT() function. Let us first create a table −

mysql> create table DemoTable    -> (    -> SequenceId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentId varchar(100)    -> ); Query OK, 0 rows affected (0.59 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(StudentId) values('STU'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(StudentId) values('STU1'); Query OK, 1 row affected (0.18 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+------------+-----------+ | SequenceId | StudentId | +------------+-----------+ | 1 | STU | | 2 | STU1 | +------------+-----------+ 2 rows in set (0.00 sec)

Here is the query to update string field by concatenating to it −

mysql> update DemoTable -> set StudentId=concat(StudentId,'-','101'); Query OK, 2 rows affected (0.14 sec) Rows matched: 2 Changed: 2 Warnings: 0

Let us check all the records once again from the table −

mysql> select *from DemoTable;

Output

+------------+-----------+ | SequenceId | StudentId | +------------+-----------+ | 1 | STU-101 | | 2 | STU1-101 | +------------+-----------+ 2 rows in set (0.00 sec)