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)

AmitDiwan

Published on 06-Apr-2020 13:09:37

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