update 表名

set

字段1 = 值1,

字段2 = 值2,

...

where 筛选条件

#查找到to_date="9999-01-01"的员工的员工编号

update salaries set salary= 1.1*salary where to_date="9999-01-01"

and emp_no in(select emp_no from emp_bonus)

两表关联 update emp_bonus e join salaries s on e.emp_no =s.emp_no set s.salary= 1.1*salary where s.to_date="9999-01-01"