MySQL query to update different fields based on a condition?

Let us first create a −

mysql> create table DemoTable1436
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> Name varchar(20)
   -> );
Query OK, 0 rows affected (1.06 sec)

Insert some records in the table using insert −

mysql> insert into DemoTable1436(Name) values('Chris');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable1436(Name) values('David');
Query OK, 1 row affected (0.40 sec)
mysql> insert into DemoTable1436(Name) values('Bob');
Query OK, 1 row affected (0.35 sec)
mysql> insert into DemoTable1436(Name) values('David');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable1436(Name) values('David');
Query OK, 1 row affected (0.31 sec)

Display all records from the table using select −

mysql> select * from DemoTable1436;

This will produce the following output −

+----+-------+
| Id | Name  |
+----+-------+
|  1 | Chris |
|  2 | David |
|  3 | Bob   |
|  4 | David |
|  5 | David |
+----+-------+
5 rows in set (0.00 sec)

Following is the query to update different fields based on a condition −

mysql> update DemoTable1436
   -> set Name=IF(Name='David','Carol Taylor',Name)
   -> where Id=2;
Query OK, 1 row affected (0.31 sec)
Rows matched: 1  Changed: 1 Warnings: 0

Let us check the table records once again −

mysql> select * from DemoTable1436;

This will produce the following output −

+----+--------------+
| Id | Name         |
+----+--------------+
|  1 | Chris        |
|  2 | Carol Taylor |
|  3 | Bob          |
|  4 | David        |
|  5 | David        |
+----+--------------+
5 rows in set (0.00 sec)