6、 (1) /*定义关系模式职员*/ CREATE TABLE Staff (Sno CHAR(9) PRIMARY KEY, Sname CHAR(20), Sage SMALLINT, SJob CHAR(10), Sal INT, Dno CHAR(20) ) /*定义关系模式部门*/ CREATE TABLE Department (Dno CHAR(20) PRIMARY KEY, Dname CHAR(20), Manager CHAR(20), Tel CHAR(10) ) (2) CREATE TABLE Department (Dno CHAR