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