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如何在oracle中的嵌套表中添加CHECK约束？

对象类型：

Depend_t (depname: varchar2(12), gender: char(1), bdate: date, relationship:varchar2(10))\n

Depend_t 的 Dependtb_t 表

Emp_t (eno: number(4), ename: varchar2(15), edept: ref dept_t, salary: number(8,2),\n

家属：dependtb_t)

Dept_t (dno: number(2), dname: varchar2(12), mgr ref emp_t)\nProj_t (pno: number(4), pname: varchar2(15), pdept ref dept_t, budget: number(10,2))\nWork_t (wemp: ref emp_t, wproj: ref proj_t, since: date, hours: number(4,2))\n

表格：

Emp of Emp_t (eno primary key, edept references dept, nested table dependents store as dependent_tb)\n\nDept of Dept_t (dno primary …