所以我有一个帐户表，员工表和一个客户表。如何在帐户表上设置约束，以便员工不能成为他/她工作的同一分支的客户。
帐户代码表
create type account_type as object(
accNum number,
accType varchar2(15),
balance number,
bID ref branch_type,
inRate number,
limitOfFreeOD number,
custID ref customer_type,
openDate DATE)
/
create table account_table of account_type(
primary key (accNum))
/
员工表代码
create type employee_type as object(
empID integer,
eName EmployeeName,
eAddress EmployeeAddress,
eContact EmployeeContact,
phone tp_phone_array,
supervisorID ref employee_type,
eDetails EmployeeWorkDetails,
bID ref branch_type,
joinDate Date);
/
create table employee_table of employee_type(
primary key (empID))
/
客户表代码
create type customer_type as object(
custID number,
cName customerName,
cAddress customerAddress,
cHomeContact custhomeContact,
cMobile tp_mobile_array,
cTaxDetails custTaxDetails)
/
create table customer of customer_type(
primary key (custID))
/
目前我在帐户表中添加了这样的普通客户数据：
insert into account_table
select account_type('1520','current','4154.20',ref(b),'0.090','200',ref(c),'20-Aug-16')
from branch b
where b.bID = '500'
and c.custID = '301';
/
这些是表格属性：
帐户（accNum，accType，balance，bID，inRate，limitOfFreeOD，openDate）
员工（empID，street，city，postCode，title，firstName，surName，empHomePhone， empMobile1，empMobile2，supervisorID，position，salary，niNum，bID，joinDate）
客户（custID，street，city，postCode，title，firstName，surName，custHomePhone， custMobile1，custMobile2，niNum）
有任何帮助吗？感谢。