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法律研究MySQL 编辑和更新包含员工工资在内的记录
MySQL 中使用 UPDATE 命令来更新记录。通过它，SET 命令用于设置新值。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 ); Query OK, 0 rows affected (0.57 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Chris',56780);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Robert',45670);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('Mike',87654);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(EmployeeName,EmployeeSalary) values('David',34569);
Query OK, 1 row affected (0.11 sec)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)
以下是更新记录并设置新值的查询 -
mysql> update DemoTable set EmployeeSalary=EmployeeSalary+12346; Query OK, 4 rows affected (0.14 sec) 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)
更新于: 04-Oct-2019
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