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