MySQL query to replace a column value

Let us first create a table −

mysql> create table DemoTable (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Score int ); Query OK, 0 rows affected (0.45 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Score) values(56); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable(Score) values(78); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Score) values(34); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Score) values(55); Query OK, 1 row affected (0.37 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+-------+ | StudentId | Score | +-----------+-------+ |         1 |    56 | |         2 |    78 | |         3 |    34 | |         4 |    55 | +-----------+-------+ 4 rows in set (0.00 sec)

Following is the query to replace column value −

mysql> update DemoTable    set Score=95 where StudentId=3; Query OK, 1 row affected (0.12 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 | Score | +-----------+-------+ |         1 |    56 | | 2 |    78 | | 3 |    95 | | 4 |    55 | +-----------+-------+ 4 rows in set (0.00 sec)