MySQL: update field with Group By?

To update field with GROUP BY, use ORDER BY LIMIT with UPDATE command −

mysql> create table DemoTable2018    -> (    -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> EmployeeName varchar(20),    -> EmployeeSalary int    -> ); Query OK, 0 rows affected (0.61 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable2018(EmployeeName,EmployeeSalary) values('Chris',10000); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2018(EmployeeName,EmployeeSalary) values('David',12560); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable2018(EmployeeName,EmployeeSalary) values('Chris',25400); Query OK, 1 row affected (0.09 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable2018;

This will produce the following output −

+------------+--------------+----------------+ | EmployeeId | EmployeeName | EmployeeSalary | +------------+--------------+----------------+ | 1          | Chris       | 10000           | | 2          | David       | 12560           | | 3          | Chris       | 25400           | +------------+--------------+----------------+ 3 rows in set (0.00 sec)

Here is the query to MySQL update field −

mysql> update DemoTable2018    -> set EmployeeSalary=EmployeeSalary+2500 where EmployeeName='Chris'    -> order by EmployeeId limit 1; Query OK, 1 row affected (0.13 sec) Rows matched: 1 Changed: 1 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable2018;

This will produce the following output −

+------------+--------------+----------------+ | EmployeeId | EmployeeName | EmployeeSalary | +------------+--------------+----------------+ | 1          | Chris        | 12500          | | 2          | David        | 12560          | | 3          | Mike         | 25400         | +------------+--------------+----------------+ 3 rows in set (0.00 sec)