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Add some value to an int type column value in a table without knowing its current value in SQL?
For this, simply use UPDATE command along with SET. Let us first create a table −
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentScore int ); Query OK, 0 rows affected (0.81 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentScore) values(78); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable(StudentScore) values(89); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(StudentScore) values(67); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentScore) values(95); Query OK, 1 row affected (0.25 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 1 | 78 | | 2 | 89 | | 3 | 67 | | 4 | 95 | +-----------+--------------+ 4 rows in set (0.00 sec)
Following is the query to add some value to an int in a database without knowing its current value −
mysql> update DemoTable set StudentScore=StudentScore+21 where StudentId=3; Query OK, 1 row affected (0.22 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 −
+-----------+--------------+ | StudentId | StudentScore | +-----------+--------------+ | 1 | 78 | | 2 | 89 | | 3 | 88 | | 4 | 95 | +-----------+--------------+ 4 rows in set (0.00 sec)
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