How can I write this in sql? (an another headcracker challenging the report)

Hi guys!

I need to create / generate a report. I intend to do all of this with only pure SQL.
Been cracking my head for days, but nothing helped.

Hope you gurus here me straightened out.

Here it goes. I have a table

TABLE USAGE_REPORT
------------------------------------
Date date of daily
BalanceCF NUMBER - the sum of initial departure or (balancebf)
Topup_amount NUMBER amount topup so far
Usage1 NUMBER - duration of the use of $ on certain prod
2 NUMBER - duration of the use of $ on certain prod
BalanceBF NUMBER - BalanceCF + refill - usage1-2 (which is also the next date of BalanceCF)

-----------------------------------------------

Example1
Please see this link
http://img9.imageshack.us/img9/708/88149028.gif

asumming that is my sql

WITH dates in the FORM
(
SELECT trunc (sysdate) + level dmy
DUAL CONNECT BY level < 366
),
Charging as
(
As the SELECT trunc (purchase_date), sum (payment_amount)
Purchase
Trunc GROUP (purchase_date)
),
Usage1 as
(
As the SELECT trunc (connect_date), sum (charged_amount)
OF tab1
WHERE prod_id = "xxx".
GROUP BY trunc (connect_date)
),
2 as
(
As the SELECT trunc (connect_date), sum (charged_amount)
Of THE tab2
WHERE prod_id = "yyy".
GROUP BY trunc (connect_date)
)
SELECT * DATE D
LEFT OUTER JOIN RELOAD T
WE (D.DMY = T.DATED)
LEFT OUTER JOIN USAGE1 U1
WE (D.DMY = U1. DATE OF THE)
LEFT OUTER JOIN U2 2
WE (D.DMY = U2. (DATED);

However

T1) how can I start to 'launch' the 1st row
BALANCECF so that i can do the math
of

BALANCECF + REFILL - USAGE1 - 2 = BALANCEBF

Q2) how can I put the value of BALANCEBF in the 2nd line of BALANCECF to make more calculation?

Q3) is that it has something to do and connect? parent-child relationship

Q4) brief how to make it look like the photo attach above?

Help, please!
Best regards
Noob

I use 200 as initial balance_cf. did you not sample data, so code below is not tested:

WITH dates as (
               SELECT  TRUNC(SYSDATE) + level dmy,
                       200 balance_cf
                 FROM  DUAL
                 CONNECT BY level < 366
              ),
     topUP as (
               SELECT  trunc(purchase_date) dated,
                       sum(payment_amount) topup_amount
                 FROM  purchase
                 GROUP by trunc(purchase_date)
              ),
    Usage1 as (
               SELECT  trunc(connect_date) dated,
                       sum(charged_amount) usage_amount
                 FROM  tab1
                 WHERE prod_id = 'xxx'
                 GROUP BY trunc(connect_date)
              ),
    Usage2 as (
               SELECT  trunc(connect_date) dated,
                       sum(charged_amount) usage2_amount
                 FROM  tab2
                 WHERE prod_id = 'yyy'
                 GROUP BY trunc(connect_date)
              )
SELECT  dmy,
        balance_cf + sum(topup_amount - usage1_amount - usage2_amount) over order by dmy rows between unbounded preceding and 1 preceding) balance_cf
        topup_amount,
        usage1_amount,
        usage2_amount,
        balance_cf + sum(topup_amount - usage1_amount - usage2_amount) over order by dmy) balance_bf
  FROM  DATES D LEFT OUTER JOIN TOPUP T ON (D.DMY = T.DATED)
                LEFT OUTER JOIN USAGE1 U1 ON (D.DMY = U1.DATED)
                LEFT OUTER JOIN USAGE2 U2 ON (D.DMY = U2.DATED)
  ORDER BY dmy
/

SY.

Tags: Database

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