子查詢與子句中H2DB

Question

我有一個簡單的SQL查詢來計算就像在一個部門中的所有員工（兒童中）：

With Temp(id) AS 
(
     Select d.id From DEPARTMENT d 
    Where d.id = 1 
    UNION ALL 
    Select d.id From DEPARTMENT d JOIN Temp te ON d.idDepartment = te.id 
) 
Select count(*) From 
(
    Select e.id From Employee e Join Temp te On e.idDepartment = te.id 
) 

但我給一個錯誤「的StackOverflow」，我不知道在哪裏是錯誤的，你能幫助我嗎？ 存在用於測試情況下，一些數據： 表部：

ID----------departmentName-----------idDepartment(id parent) 
1    A       0 
2    B       1 

表EMPLOYEE：

id----------employeeName------------idDepartment 
1    E_1      1 
2    E_2      1 
3    E_3      2 

因此，當我在一處（A）選擇Eployee的量 - >結果：3，如果部門B - >結果：1​​ 謝謝！

Answer 1

我想我有一個可行的解決方案：

create table Department(id int, name varchar(255), idDepartment int); 
create table Employee(id int, name varchar(255), idDepartment int); 
insert into Department values(1, 'A', 0), (2, 'B', 1); 
insert into Employee values(1, 'E1', 1), (2, 'E2', 1), (3, 'E3', 2); 
with recursive temp(id) as (
    select 1 union all 
    select d.id from temp te 
    inner join Department d on d.idDepartment = te.id 
) 
select count(*) from temp te 
inner join Employee e on e.idDepartment = te.id; 
drop table Department; 
drop table Employee;