您今天不能在检查约束中使用. 如官方文档所述:

You cannot use today in the check constraint. As the official documentation states:

检查约束是使用搜索条件定义的.搜索条件不能包含用户定义的例程，子查询，聚合，主机变量或rowid.此外，条件不能包含内置的变体函数CURRENT，USER，SITENAME，DBSERVERNAME或TODAY.

Check constraints are defined using search conditions. The search condition cannot contain user-defined routines, subqueries, aggregates, host variables, or rowids. In addition, the condition cannot contain the variant built-in functions CURRENT, USER, SITENAME, DBSERVERNAME, or TODAY.

我认为解决方案可以使用插入/更新触发器.

I think a solution can be using an insert/update trigger.