Let us see an example and create a table first.
mysql> create table Add1ToExistingValue -> ( -> Value int -> ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command.
The query is as follows
mysql> insert into Add1ToExistingValue values(10); Query OK, 1 row affected (0.12 sec) mysql> insert into Add1ToExistingValue values(13); Query OK, 1 row affected (0.15 sec) mysql> insert into Add1ToExistingValue values(15); Query OK, 1 row affected (0.13 sec) mysql> insert into Add1ToExistingValue values(16); Query OK, 1 row affected (0.14 sec) mysql> insert into Add1ToExistingValue values(20); Query OK, 1 row affected (0.16 sec) mysql> insert into Add1ToExistingValue values(40); Query OK, 1 row affected (0.15 sec) mysql> insert into Add1ToExistingValue values(50); Query OK, 1 row affected (0.11 sec) mysql> insert into Add1ToExistingValue values(55); Query OK, 1 row affected (0.17 sec) mysql> insert into Add1ToExistingValue values(56); Query OK, 1 row affected (0.17 sec)
Display all records from the table using select statement.
The query is as follows
mysql> select *from Add1ToExistingValue;
The following is the output
+-------+ | Value | +-------+ | 10 | | 13 | | 15 | | 16 | | 20 | | 40 | | 50 | | 55 | | 56 | +-------+ 9 rows in set (0.00 sec)
Here is the query to add +1 to existing values
mysql> update Add1ToExistingValue set Value=Value+1 where Value >=20; Query OK, 5 rows affected (0.08 sec) Rows matched: 5 Changed: 5 Warnings: 0
Let us check the table records from the table using select statement.
The query is as follows
mysql> select *from Add1ToExistingValue;
The following is the output
+-------+ | Value | +-------+ | 10 | | 13 | | 15 | | 16 | | 21 | | 41 | | 51 | | 56 | | 57 | +-------+ 9 rows in set (0.00 sec)