create table if not exists mydb1.employee(
	id int,
	name varchar(20),
	gender varchar(20),
	salary int);

insert into mydb1.employee values
	(1,'zhangsan','male',2000),
	(2,'lisi','male',1000),
	(3,'wangwu','female',4000);

update mydb1.employee set salary = 5000 where name = 'zhangsan';
update mydb1.employee set salary = 3020, gender='female' where name = 'lisi';
update mydb1.employee set salary = salary + 50 where name = 'wangwu';