MySQL में केवल इंटीजर फील्ड को अपडेट करना

उदाहरण

टेबल बनाएं:

mysql> create table DemoTable702 (
    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
    -> StudentName varchar(100),
    -> StudentScore int
    -> );
Query OK, 0 rows affected (0.56 sec)

रिकॉर्ड डालें:

mysql> insert into DemoTable702(StudentName, StudentScore) values('Chris', 56);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable702(StudentName, StudentScore) values('Robert', 21);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable702(StudentName, StudentScore) values('Mike', 89);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable702(StudentName, StudentScore) values('David', 99);
Query OK, 1 row affected (0.20 sec)

सभी रिकॉर्ड देखें:

mysql> select * from DemoTable702;

आउटपुट

+-----------+-------------+--------------+
| StudentId | StudentName | StudentScore |
+-----------+-------------+--------------+
| 1         | Chris       | 56           |
| 2         | Robert      | 21           |
| 3         | Mike        | 89           |
| 4         | David       | 99           |
+-----------+-------------+--------------+
4 rows in set (0.00 sec)

MySQL में इंटीजर अपडेट करने की क्वेरी:

mysql> update DemoTable702 set StudentScore = StudentScore + 9 where StudentId = 2;
Query OK, 1 row affected (0.09 sec)
Rows matched: 1 Changed: 1 Warnings: 0

फिर से रिकॉर्ड देखें:

mysql> select * from DemoTable702;

आउटपुट

+-----------+-------------+--------------+
| StudentId | StudentName | StudentScore |
+-----------+-------------+--------------+
| 1         | Chris       | 56           |
| 2         | Robert      | 30           |
| 3         | Mike        | 89           |
| 4         | David       | 99           |
+-----------+-------------+--------------+
4 rows in set (0.00 sec)

नोट: WHERE क्लॉज के बिना सभी पंक्तियों का स्कोर 9 से बढ़ जाता।