Multiple self joins plus one inner join - sql

Question

I have two tables: ck_startup and ck_price. The price table contains the columns cu_type, prd_type, part_cd, qty, and dllrs. The startup table is linked to the price table through a one-to-many relationship on ck_startup.prd_type_cd = ck_price.prd_type.
The price table contains multiple entries for the same product/part/qty but under different customer types. Not all customer types have the same unique combination of those three values. I'm trying to create a query that will do two things:
Join some columns from ck_startup onto ck_price (description, and some additional values).
Join ck_price onto itself with a dllrs column for each customer type. So in total I would only have one instance of each unique key of product/part/qty, and a value in each customer's price column if they have one.
I've never worked with self joining tables, and so far I can only get records to show up where both customers have the same options available.
And because someone is going to demand I post sample code, here's the crappy query that doesn't show missing prices:
select pa.*, pac.dllrs from ck_price pa
join ck_price pac on pa.prd_type = pac.prd_type and pa.part_carbon_cd = pac.part_carbon_cd and pa.qty = pac.qty
where pa.cu_type = 'A' and pac.cu_type = 'AC';
EDIT: Here's sample data from the two tables, and how I want them to look when I'm done:
CK_STARTUP
+-----+-----------------+-------------+
| CD | DSC | PRD_TYPE_CD |
+-----+-----------------+-------------+
| 3D | Stuff | SKD3 |
| DC | Different stuff | SKD |
| DN2 | Similar stuff | SKD |
+-----+-----------------+-------------+
CK_PRICE
+---------+-------------+---------+-----+-------+
| CU_TYPE | PRD_TYPE_CD | PART_CD | QTY | DLLRS |
+---------+-------------+---------+-----+-------+
| A | SKD3 | 1 | 100 | 10 |
| A | SKD3 | 1 | 200 | 20 |
| A | SKD3 | 1 | 300 | 30 |
| A | SKD | 1 | 100 | 50 |
| A | SKD | 1 | 200 | 100 |
| AC | SKD3 | 1 | 300 | 30 |
| AC | SKD | 1 | 100 | 100 |
| AC | SKD | 1 | 200 | 200 |
| AC | SKD | 1 | 300 | 300 |
| AC | SKD | 1 | 400 | 400 |
+---------+-------------+---------+-----+-------+
COMBO:
+----+-----------------+---------+-----+---------+----------+
| CD | DSC | PART_CD | QTY | DLLRS_A | DLLRS_AC |
+----+-----------------+---------+-----+---------+----------+
| 3D | Stuff | 1 | 100 | 10 | null |
| 3D | Stuff | 1 | 200 | 20 | null |
| 3D | Stuff | 1 | 300 | 30 | 60 |
| DC | Different stuff | 1 | 100 | 50 | 100 |
| DC | Different stuff | 1 | 200 | 100 | 200 |
| DC | Different stuff | 1 | 300 | null | 300 |
| DC | Different stuff | 1 | 400 | null | 400 |
+----+-----------------+---------+-----+---------+----------+

Answer 1

Ok, take a look at below query and at the results:
SELECT *
FROM (SELECT
cs.cd, cs.dsc, cp.part_cd, cp.qty, cp.dllrs, cp.cu_type
FROM ck_startup cs
JOIN ck_price cp ON (cs.prd_type_cd = cp.prd_type_cd))
PIVOT (SUM(dllrs) AS dlllrs FOR (cu_type) IN ('A' AS a, 'AC' AS ac))
ORDER BY cd, qty
;
Output:
CD DSC PART_CD QTY A_DLLLRS AC_DLLLRS
-------- ----------------- ---------- ------- ---------- ----------
3D Stuff 1 100 10
3D Stuff 1 200 20
3D Stuff 1 300 30 30
DC Different stuff 1 100 50 50
DC Different stuff 1 200 100 100
DC Different stuff 1 300 150
DC Different stuff 1 400 200
DN2 Similar stuff 1 100 50 50
DN2 Similar stuff 1 200 100 100
DN2 Similar stuff 1 300 150
DN2 Similar stuff 1 400 200
It is not what you would expect, because I do not understand why you have different values in DLLRS_AC column that are in the CK_PRICE table? I mean, for example, why do you have 400 in last line of your output, not 200? Why is this value doubled (as others are in DLLRS_AC column)?
If you are using Oracle 10g, you can achieve the same result using DECODE and GROUP BY, take a look:
SELECT
cd,
dsc,
part_cd,
qty,
SUM(DECODE(cu_type, 'A', dllrs, NULL)) AS dllrs_a,
SUM(DECODE(cu_type, 'AC', dllrs, NULL)) AS dllrs_ac
FROM (
SELECT
cs.cd, cs.dsc, cp.part_cd, cp.qty, cp.dllrs, cp.cu_type
FROM ck_startup cs
JOIN ck_price cp ON (cs.prd_type_cd = cp.prd_type_cd)
)
GROUP BY cd, dsc, part_cd, qty
ORDER BY cd, qty;
Result is the same.
If you want to read more about pivoting, I recommend article by Tim Hall: Pivot and Unpivot at Oracle Base