Update only a single column in a MySQL table and increment on the basis of a condition

Let us first create a table −

mysql> create table DemoTable (    Name varchar(50),    Score int ); Query OK, 0 rows affected (1.02 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Sam',45); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Mike',28); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable values('Carol',27); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('David',67); Query OK, 1 row affected (0.19 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+-------+ | Name  | Score | +-------+-------+ | Sam   | 45 | | Mike  | 28 | | Carol | 27 | | David | 67 | +-------+-------+ 4 rows in set (0.00 sec)

Following is the query to update only a single column and increment on the basis of a condition −

mysql> update DemoTable set Score=Score+10 where Score < 30; Query OK, 2 rows affected (0.22 sec) Rows matched: 2 Changed: 2 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-------+-------+ | Name | Score | +-------+-------+ | Sam | 45 | | Mike | 38 | | Carol | 37 | | David | 67 | +-------+-------+ 4 rows in set (0.00 sec)