Return summary for the masters of query classes

Hi all

I use oracle database 11g r2.

I have 2 tables,

create tabel expenses_heads (exp_head_id number primary key,
                                             Main_exp_name varchar2(100) not null,
                                             refer_exp_head_id number);
alter table expenses_heads add constraint fk_refer_head_id foreign key(refer_exp_id) references expenses_heads(exp_head_id);
create table expenses (exp_id number primary key,
                                   exp_head_id number references  expenses_heads(exp_head_id) not null,
                                   exp_name varchar2(100) not null,
                                   exp_date date not null,
                                   exp_amount number not null,
                                   receipt varchar2(20),
                                   remarks varchar2(4000));
i have the following data,
insert into expenses_heads values(1,'School',null);
   insert into expenses_heads values(2,'College',null);
insert into expenses_heads values(3,'Bills',1);
insert into expenses_heads values(4,'Hardware',1);
  insert into expenses_heads values(5,'Food',1);
insert into expenses_heads values(6,'Dress',1);
insert into expenses_heads values(7,'Hardware',1);
  insert into expenses_heads values(8,'Admission',2);
   insert into expenses_heads values(9,'Office',2);
insert into expenses values(1,3,'Electricity Bill',sysdate,1000,null,null);
insert into expenses values(2,3,'Water Bill',sysdate,100,null,null);
insert into expenses values(3,4,'Chair',sysdate,1000,null,null);
  insert into expenses values(4,4,'Tables',sysdate,200,null,null);
  insert into expenses values(5,8,'Admin Ceremony',sysdate,3000,null,null);
    insert into expenses values(6,9,'Stationary',sysdate,2000,null,null);
commit;

now, I want to write a query relating analytical columns, Main_exp_name(from expenses_heads) and Total_amount (from expenses)

result should look as below

Main_exp_name                         Total_Amount
College                                        2300
university                                     5000

I think it could be written using the Group of and rollup, cube or grouping sets, but confused.

kindly help.

Hierarchical query using:

select h.main_exp_name, sum (exp_amount) exp_amount
from expenses e
join
  (
    select refer_exp_id,
      exp_head_id,
      prior main_exp_name main_exp_name
    from expenses_heads
      connect by refer_exp_id = prior exp_head_id
  )
  h
on
  (
    e.exp_head_id = h.exp_head_id
  )
 where main_exp_name is not null
 group by h.main_exp_name;

MAIN_EXP_NAME                                                                                        EXP_AMOUNT
---------------------------------------------------------------------------------------------------- ----------------------
School                                                                                               2300
College                                                                                              5000

Tags: Database

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Published by: Vinodh2 on November 23, 2011 01:29
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WITH
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     (
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               avbom_part_usg_sakey,
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Return summary for the masters of query classes

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