Update MySQL column based on email address?

Let us first create a table −

mysql> create table DemoTable    -> (    -> EmailAddress varchar(20),    -> Score int    -> ); Query OK, 0 rows affected (1.05 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Chris@gmail.com',67); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert@gmail.com',57); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David@gmail.com',98); Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+------------------+-------+ | EmailAddress     | Score | +------------------+-------+ | Chris@gmail.com  |    67 | | Robert@gmail.com |    57 | | David@gmail.com  |    98 | +------------------+-------+ 3 rows in set (0.00 sec)

Here is the query to update MySQL column based on email address −

mysql> update DemoTable    -> set Score=89    -> where EmailAddress='Robert@gmail.com'; Query OK, 1 row affected (0.25 sec) Rows matched: 1 Changed: 1 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+------------------+-------+ | EmailAddress     | Score | +------------------+-------+ | Chris@gmail.com  |    67 | | Robert@gmail.com |    89 | | David@gmail.com  |    98 | +------------------+-------+ 3 rows in set (0.00 sec)