How to replace a part of the string (domain name after @) using MySQL?

Let us first create a table −

mysql> create table DemoTable    -> (    -> EmailId varchar(30)    -> ); Query OK, 0 rows affected (0.53 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('John123@gmail.com'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('John123@yahoo.com'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+---------------------+ | EmailId             | +---------------------+ | John123@example.com | | John123@gmail.com   | | John123@yahoo.com   | | John123@example.com | +---------------------+ 4 rows in set (0.00 sec)

Here is the query to replace a part of the string −

mysql> update DemoTable    -> set EmailId=replace(EmailId,'John123@example.com','John123@gmail.com'); Query OK, 2 rows affected (0.16 sec) Rows matched: 4 Changed: 2 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------------------+ | EmailId           | +-------------------+ | John123@gmail.com | | John123@gmail.com | | John123@yahoo.com | | John123@gmail.com | +-------------------+ 4 rows in set (0.00 sec)