You can update field to add value to an existing value with the help of UPDATE and SET command. The syntax is as follows −
UPDATE yourTableName SET yourColumnName = yourColumnName+integerValueToAdd WHERE yourCondition;
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table addingValueToExisting -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(30), -> GameScore int, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.58 sec)
Insert records in the table using insert command. The query is as follows −
mysql> insert into addingValueToExisting(Name,GameScore) values('John',89);
Query OK, 1 row affected (0.11 sec)
mysql> insert into addingValueToExisting(Name,GameScore) values('Mike',56);
Query OK, 1 row affected (0.28 sec)
mysql> insert into addingValueToExisting(Name,GameScore) values('Sam',99);
Query OK, 1 row affected (0.18 sec)
mysql> insert into addingValueToExisting(Name,GameScore) values('Carol',100);
Query OK, 1 row affected (0.17 sec)
mysql> insert into addingValueToExisting(Name,GameScore) values('David',67);
Query OK, 1 row affected (0.25 sec)
mysql> insert into addingValueToExisting(Name,GameScore) values('Bob',78);
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement. The query is as follows −
mysql> select *from addingValueToExisting;
The following is the output −
+----+-------+-----------+ | Id | Name | GameScore | +----+-------+-----------+ | 1 | John | 89 | | 2 | Mike | 56 | | 3 | Sam | 99 | | 4 | Carol | 100 | | 5 | David | 67 | | 6 | Bob | 78 | +----+-------+-----------+ 6 rows in set (0.00 sec)
Update field to add a value to existing value. For our example, let us update 100 with the value 110 by adding 10. The query is as follows −
mysql> update addingValueToExisting set GameScore = GameScore+10 where Id = 4; Query OK, 1 row affected (0.23 sec) Rows matched − 1 Changed − 1 Warnings − 0
Check the specific record has been updated or not. The query is as follows −
mysql> select *from addingValueToExisting where Id = 4;
The following is the output −
+----+-------+-----------+ | Id | Name | GameScore | +----+-------+-----------+ | 4 | Carol | 110 | +----+-------+-----------+ 1 row in set (0.00 sec)
Look at the above output, the value 100 is incremented by 10, which is now 110.