在oracle数据库中怎样创建主外键关系答:创建主表:CREATE TABLE SCOTT.DEPT (DEPTNO NUMBER(2,0) PARIMARY KEY, DNAME VARCHAR2(14), LOC VARCHAR2(13));创建副表及外键:CREATE TABLE EMP (EMPNO NUMBER(4,0) PRIMARY KEY, ENAME VARCHAR2(10), JOB VARCHAR2(9), MGR NUMBER(4,0), HIREDATE DATE, SAL NUMBER(7,2), COMM ...