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)