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在MySQL表中插入重复记录时显示错误

2024-05-19 13:53:04 344

为此，您可以使用UNIQUEKEY。让我们首先创建一个表-

create table DemoTable1553
   -> (
   -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> EmployeeName varchar(20),
   -> EmployeeSalary int
   -> );

这是添加唯一键的查询-

alter table DemoTable1553 add unique(EmployeeSalary);
Records: 0  Duplicates: 0  Warnings: 0

使用插入命令在表中插入一些记录-

insert into DemoTable1553(EmployeeName,EmployeeSalary) values('Chris',45000);
insert into DemoTable1553(EmployeeName,EmployeeSalary) values('David',35000);
insert into DemoTable1553(EmployeeName,EmployeeSalary) values('Sam',25000);
insert into DemoTable1553(EmployeeName,EmployeeSalary) values('Carol',45000);
ERROR 1062 (23000): Duplicate entry '45000' for key 'EmployeeSalary'

使用select语句显示表中的所有记录-

select * from DemoTable1553;

这将产生以下输出-

+------------+--------------+----------------+
| EmployeeId | EmployeeName | EmployeeSalary |
+------------+--------------+----------------+
|          1 | Chris        |          45000 |
|          2 | David        |          35000 |
|          3 | Sam          |          25000 |
+------------+--------------+----------------+
3 rows in set (0.00 sec)

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在MySQL表中插入重复记录时显示错误

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