sql遞迴查詢

--有兩個表，a 部門表，儲存部門id 名稱 上級部門；b表 儲存部門員工表 id 姓名 部門id

--現在我希望通過一條sql語句取得所有頂級部門下的員工(包含下級部門的員工)
--drop table dept;
create table dept(
dept_id varchar(5), 
up_id varchar(5),
misc varchar(20),
primary key (dept_id)
);insert into dept (dept_id, up_id, misc) values ('12', '-', '頂級部門2');
insert into dept (dept_id, up_id, misc) values ('1', '-', '頂級部門');
insert into dept (dept_id, up_id, misc) values ('01', '1', '部門1');
insert into dept (dept_id, up_id, misc) values ('02', '1', '部門2');
insert into dept (dept_id, up_id, misc) values ('003', '02', '部門3');
--drop table employ;
create table employ(
emp_id varchar(6),
name varchar(20),
dept_id varchar(5),
primary key(emp_id)
);insert into employ (emp_id, name, dept_id) values ('00001', '錢八', '1');
insert into employ (emp_id, name, dept_id) values ('00002', '趙六', '01');
insert into employ (emp_id, name, dept_id) values ('00003', '王五', '02');
insert into employ (emp_id, name, dept_id) values ('00004', '李四', '02');
insert into employ (emp_id, name, dept_id) values ('00005', '張三', '003');
--查詢部門為1-頂級部門下的所有員工
with temp(emp_id,name,dept_id) as (
select e.emp_id,e.name,e.dept_id from employ e left join dept d on e.dept_id = d.dept_id where e.dept_id = '1' 
union all 
select d2.emp_id,d2.name,d2.dept_id from temp t,
（ select emp_id,name,e.dept_id,d3.up_id from employ e,dept d3 where e.dept_id = d3.dept_id）d2 where t.dept_id = d2.up_id
)select distinct(emp_id),name,dept_id from temp order by emp_id;

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