MySQL 触发设置工资 insert/update 限制

Question

所以我有 table 名员工，我正在努力确保员工的收入不能超过他们的经理。

这是我尝试为此创建触发器的尝试

create trigger staffsalary before update on employees for each row begin
if ((new.salary < 50000) where staffid < 200000) 
then signal sqlstate '45000' set message_text = 'A promotion is required
for staff to earn above 50k'; end if; end^^

我还尝试调整触发器以说出像“1%”这样的员工，因为我的非经理员工 ID 以 1 开头。

但没有任何效果，并且 MySQL 不断向我显示错误，其中出现“其中 staffID < 200000”。

帮助或建议哪些替代方案可能有效，我们将不胜感激！

Answer 1

MariaDB [sandbox]> delimiter $$
MariaDB [sandbox]>
MariaDB [sandbox]> create trigger staffsalary before update on employees for each row begin
    -> if ((new.salary > 50000) and new.emp_no < 5) then
    -> signal sqlstate '45000'
    -> set message_text = 'A promotion is required for staff to earn above 50k';
    -> end if;
    -> end $$
Query OK, 0 rows affected (0.05 sec)

MariaDB [sandbox]>
MariaDB [sandbox]> delimiter ;
MariaDB [sandbox]>
MariaDB [sandbox]> select emp_no, salary from employees;
+--------+--------+
| emp_no | salary |
+--------+--------+
|      1 |  20000 |
|      2 |  39500 |
|      3 |  50000 |
|      4 |  19500 |
|      5 |  10000 |
|      6 |  19500 |
|      7 |  40000 |
|      9 |   NULL |
+--------+--------+
8 rows in set (0.00 sec)

MariaDB [sandbox]>
MariaDB [sandbox]> update employees set salary = 66000 where emp_no = 1;
ERROR 1644 (45000): A promotion is required for staff to earn above 50k

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