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正确的MySQL INSERT ... ON DUPLICATE KEY语法？

2024-05-18 08:50:07 327

语法如下-

insert into yourTableName values(yourValue1,yourValue2,..N)
on duplicate key update yourColumnName1=yourValue1,yourColumnName2=yourValue2,....N;

让我们首先创建一个表-

create table DemoTable1539
   -> (
   -> EmployeeName varchar(20),
   -> EmployeeSalary int,
   -> UNIQUE KEY(EmployeeName)
   -> );

使用插入命令在表中插入一些记录-

insert into DemoTable1539 values('Chris',4500) on duplicate key update EmployeeName='Robert',EmployeeSalary=8500;
insert into DemoTable1539 values('David',5500) on duplicate key update EmployeeName='Robert',EmployeeSalary=8500;
insert into DemoTable1539 values('Chris',4500) on duplicate key update EmployeeName='Robert',EmployeeSalary=8500;

使用select语句显示表中的所有记录-

select * from DemoTable1539;

这将产生以下输出-

+--------------+----------------+
| EmployeeName | EmployeeSalary |
+--------------+----------------+
| Robert       |           8500 |
| David        |           5500 |
+--------------+----------------+
2 rows in set (0.00 sec)

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正确的MySQL INSERT ... ON DUPLICATE KEY语法？

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