SQL学习笔记五去重，给新加字段赋值的方法

去掉数据重复 
增加两个字段 
alter TABLE T_Employee Add FSubCompany VARchar(20); 
ALTER TABLE T_Employee ADD FDepartment VARCHAR(20); 

给新加的字段赋值 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Development' where FNumber='DEV001'; 
UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='Development' where FNumber='DEV002'; 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='HumanResource' where FNumber='HR001'; 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='HumanResource' where FNumber='HR002'; 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='InfoTech' where FNumber='IT001'; 
UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='InfoTech' where FNumber='IT002'; 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Sales' where FNumber='SALES001'; 
UPDATE T_Employee SET FSubCompany='Beijing',FDepartment='Sales' where FNumber='SALES002'; 
UPDATE T_Employee SET FSubCompany='ShenZhen',FDepartment='Sales' where FNumber='SALES003'; 

查询并去重 
select distinct FDepartment from T_Employee 

select distinct FDepartment,FSubCompany from T_Employee