Updating only a single column value in MySQL?

Let us first create a table −

mysql> create table DemoTable770 (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Value int
);
Query OK, 0 rows affected (0.65 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable770(Value) values(10);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable770(Value) values(90);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable770(Value) values(160);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable770(Value) values(450);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable770(Value) values(560);
Query OK, 1 row affected (0.21 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable770;

This will produce the following output -

+----+-------+
| Id | Value |
+----+-------+
|  1 |    10 |
|  2 |    90 |
|  3 |   160 |
|  4 |   450 |
|  5 |   560 |
+----+-------+
5 rows in set (0.00 sec)

Following is the query to update only a single column value −

mysql> update DemoTable770
   set Value=Value+150
   where Id=4;
Query OK, 1 row affected (0.52 sec)
Rows matched: 1 Changed: 1 Warnings: 0

Let us check the description of the view −

mysql> select *from DemoTable770;

This will produce the following output -

+----+-------+
| Id | Value |
+----+-------+
|  1 |    10 |
|  2 |    90 |
|  3 |   160 |
|  4 |   600 |
|  5 |   560 |
+----+-------+
5 rows in set (0.00 sec)

AmitDiwan

Published on 03-Sep-2019 12:16:35