if判断，不可以吗？

create table Employees (
  EmployeeID char(6) primary key not null,
 Name varchar(6) not null,
 Education varchar(4) not null,
 Birthday datetime not null,
 Sex bit not null default 1,
 WorkYear tinyint null,
 Address varchar(40),
 PhoneNumber char(12) null,
  Pepartment char(3) not null  
)
insert into Employees values('000001','王林','大专','1966-01-23',1,8,'中山路32-1-508','83355668',2);
insert into Employees values('010008','伍容华','本科','1976-03-28',1,3,'北京东路100-2','83321321',1);
insert into Employees values('020010','王向容','硕士','1982-12-09',1,2,'四牌楼10-0-108','83792361',1);
insert into Employees values('020018','李丽','大专','1960-07-30',0,6,'中山东路102-2','83413301',1);
insert into Employees values('102201','刘明','本科','1972-10-18',1,3,'虎距路100-2','83606608',5);
insert into Employees values('102208','朱骏','硕士','1965-09-28',1,2,'牌楼巷5-3-106','84708817',5);
insert into Employees values('108991','钟敏','硕士','1979-08-10',0,4,'中山路10-3-105','83346722',3);
insert into Employees values('111006','张石兵','本科','1974-10-01',1,1,'解放路34-1-203','84563418',5);
insert into Employees values('210678','林涛','大专','1977-04-02',1,2,'中山北路24-35','83467336',3);
insert into Employees values('302566','李玉珉','本科','1968-09-20',1,3,'热和路209-3','58765991',4);
insert into Employees values('308759','叶凡','本科','1978-11-18',1,2,'北京西路3-7-52','83308901',4);
insert into Employees values('504209','陈林琳','大专','1969-09-03',0,5,'汉中路120-4-12','84468158',4);
 select EmployeeID,Name,Address,Pepartment=
  case Pepartment
  when 1 then '财务部'
  when 2 then '人力资源部'
  when 3 then '经理办公室'
  when 4 then '研发部'
  when 5 then '市场部'
end  
from Employees
--(3) 使用if 语句实现以上功能 

if 好像不行 你是不是想将 Employees 表的最后一列的编号换成对应的部门名称，如果是的话
你可以这样写sql语句
select EmployeeID,Name,Address,(select 部门名称 from 部门表 b where b.Pepartment =a.Pepartment )Pepartment from Employees a

如果出现if就是过程语言

oracle中没有if。。可用decode和case。。。

想用if的话就用存储过程