MySQL编辑和更新记录，包括员工工资
UPDATE命令在MySQL中用于更新记录。通过它，SET命令可用于设置新值。让我们首先创建一个表-
mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(50), EmployeeSalary int );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Chris',56780);
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Robert',45670);
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Mike',87654);
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('David',34569);使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+------------+--------------+----------------+ | EmployeeId | EmployeeName | EmployeeSalary | +------------+--------------+----------------+ | 1 | Chris | 56780 | | 2 | Robert | 45670 | | 3 | Mike | 87654 | | 4 | David | 34569 | +------------+--------------+----------------+ 4 rows in set (0.00 sec)
以下是更新记录和设置新值的查询-
mysql> update DemoTable set EmployeeSalary=EmployeeSalary+12346; Rows matched: 4 Changed: 4 Warnings: 0
让我们检查表记录-
mysql> select *from DemoTable;
这将产生以下输出-
+------------+--------------+----------------+ | EmployeeId | EmployeeName | EmployeeSalary | +------------+--------------+----------------+ | 1 | Chris | 69126 | | 2 | Robert | 58016 | | 3 | Mike | 100000 | | 4 | David | 46915 | +------------+--------------+----------------+ 4 rows in set (0.00 sec)