How to replace a particular character in a MySQL column?

To replace a particular character, use REPLACE() and to update, use the UPDATE command. Let us first create a table −

mysql> create table DemoTable1899    (    Code varchar(20)    ); Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1899 values('John_123'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1899 values('32189_Sam_987'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1899 values('Miller_David_456_909'); Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1899;

This will produce the following output −

+----------------------+ | Code                 | +----------------------+ | John_123             | | 32189_Sam_987        | | Miller_David_456_909 | +----------------------+ 3 rows in set (0.00 sec)

Here is the query to replace a particular character −

mysql> update DemoTable1899 set Code=replace(Code,'_',''); Query OK, 3 rows affected (0.00 sec) Rows matched: 3  Changed: 3 Warnings: 0

Let us check the table records once again:

mysql> select * from DemoTable1899;

This will produce the following output −

+-------------------+ | Code              | +-------------------+ | John123           | | 32189Sam987       | | MillerDavid456909 | +-------------------+ 3 rows in set (0.00 sec)