Aligning rows to columns.

Question

Hi there,
First, I got two tables.
Main Table (t1)
+------------+--------------+-------------+
| invoice_id |     Date     | Customer ID |
+------------+--------------+-------------+
|       1001 | Feb 01, 2011 |           1 |
|       2300 | Feb 05, 2011 |           2 |
|       4100 | Feb 10, 2011 |           3 |
|       5500 | Feb 15, 2011 |           1 |
+------------+--------------+-------------+Sub Table (t2)
+------------+-----+-------------+------------+-------------+
| invoice_id | qty | description | unit_price | total_price |
+------------+-----+-------------+------------+-------------+
|       1001 |   1 |      item_1 |       1.00 |        1.00 |
|       1001 |   2 |      item_2 |       2.00 |        4.00 |
|       1001 |   3 |      item_3 |       3.00 |        9.00 |
|       5500 |   4 |      item_4 |       4.00 |       16.00 |
|       5500 |   5 |      item_5 |       5.00 |       25.00 |
+------------+-----+-------------+------------+-------------+I want an output like this? I'm only interested with customer_id = 1.
+------------+--------------+-------------+------------+--------------+-------------+
| invoice_id |     Date     | total_price | invoice_id |     Date     | total_price |
+------------+--------------+-------------+------------+--------------+-------------+
|       1001 | Feb 01, 2011 |       14.00 |       5500 | Feb 15, 2011 |       41.00 |
+------------+--------------+-------------+------------+--------------+-------------+This one is for comparing the old record (invoice id = 1001) with the new record (invoice id = 5500) under the same customer_id.

Answer 1

ME_XE?with
  2    table1 as
  3  (
  4    select 1 as customer_id, 1001 as invoice_1, 5500 as invoice_2 from dual
  5  ),
  6    table2 as
  7  (
  8    select 1001 as invoice_id, 1 as qty, 'item_1' as descr, 1 as unit_price,  1.00 as total_price from dual union all
  9    select 1001 as invoice_id, 2 as qty, 'item_2' as descr, 2 as unit_price,  4.00 as total_price from dual union all
10    select 1001 as invoice_id, 3 as qty, 'item_3' as descr, 3 as unit_price,  9.00 as total_price from dual union all
11    select 5500 as invoice_id, 4 as qty, 'item_4' as descr, 4 as unit_price, 16.00 as total_price from dual union all
12    select 5500 as invoice_id, 5 as qty, 'item_5' as descr, 5 as unit_price, 25.00 as total_price from dual
13  )
14  select
15     customer_id,
16     max(decode(invoice_id, min_id, invoice_id))  as inv_1,
17     max(decode(invoice_id, min_id, total_price)) as price_1,
18     max(decode(invoice_id, max_id, invoice_id))  as inv_2,
19     max(decode(invoice_id, max_id, total_price)) as price_2
20  from
21  (
22     select
23        max(table2.invoice_id) over () as max_id,
24        min(table2.invoice_id) over () as min_id,
25       table1.customer_id,
26       table2.invoice_id,
27       sum(table2.total_price) as total_price
28     from
29       table1,
30       table2
31     where table2.invoice_id in (table1.invoice_1, table1.invoice_2)
32     group by
33       table1.customer_id,
34       table2.invoice_id
35  )
36  group by customer_id;
       CUSTOMER_ID              INV_1            PRICE_1              INV_2            PRICE_2
                 1               1001                 14               5500                 41
1 row selected.
Elapsed: 00:00:00.06
ME_XE?