Creating a query for a custom report layout

Question

hello guys,
i am really stuck with this task - i need to populate a report with rows with "0" values based on a particular criteria, here is the example: lets say we have a table BROKERS with company names, their transaction types and cumulative amounts for a current month and all months ever.
COMPANY TRAN_TYPE CURR_MNTH ALL_MNTH
Broker1 CURRENCY_SELL $1000.00 $1500000.00
Broker1 GOLD_SELL $50000.00 $2500000.00
Broker1 GOLD_BUY $80000.00 $8500000.00
Broker1 STOCKS_SELL $35000.00 $3500000.00
table BROKERS does not have a field TRAN_TYPE, but has a field TRAN_TYPE_CD which reffers to another table called TRAN_TYPE_CD_EXPL, where all the codes are explained:
TRAN_TYPE_CD TRAN_TYPE_CD_EXPLD
1 STOCKS_SELL
2 STOCKS_BUY
3 GOLD_SELL
4 GOLD_BUY
5 SILVER_SELL
6 SILVER_BUY
7 COPPER_SELL
8 COPPER_BUY
9 CURRENCY_SELL
10 CURRENCY_BUY
so the results shown above is just a simple join of those two tables:
select b.COMPANY, tt.TRAN_TYPE, b.CURR_MONTH, b.ALL_MNTH
from BROKERS b, TRAN_TYPE_CD_EXPL tt
where b.TRAN_TYPE_CD = tt.TRAN_TYPE_CD;
everything is pretty simple, but here is where the problem starts : the report i am working on should look like this:
COMPANY MARKET TRAN_TYPE CURR_MNTH ALL_MNTH
Broker1 FOREX CURRENCY_SELL $1000.00 $1500000.00
Broker1 FOREX CURRENCY_BUY $0.00 $5500000.00
Broker1 CONTRACTS GOLD_SELL $50000.00 $2500000.00
Broker1 CONTRACTS GOLD_BUY $80000.00 $8500000.00
Broker1 STOCKMARKET STOCKS_SELL $35000.00 $3500000.00
Broker1 STOCKMARKET STOCKS_BUY $0.00 $9500000.00
so let me explain :
firstable, report should contains a column MARKET, which should be populated based on the values in the column TRAN_TYPE, but the thing is there is no table MARKET in database, so each time when you need to populate it in a report or somewhere else, you need to use decode like this (assumed everybody knows where all kind of tran_types belong to):
SELECT DECODE (TRAN_TYPE_CD_EXPL.TRAN_TYPE_CD_EXPLD,
'CURRENCY_SELL', 'FOREX',
'CURRENCY_BUY', 'FOREX',
'STOCKS_SELL', 'STOCKMARKET',
'STOCKS_BUY', 'STOCKMARKET') AS MARKET,
or based on TRAN_TYPE_CD value:
SELECT DECODE (BROKERS.TRAN_TYPE_CD,
9, 'FOREX',
10, 'FOREX',
1, 'STOCKMARKET',
2, 'STOCKMARKET') AS MARKET,
2) problem number 2 is more complicated : the report logic says - is a company has at least one transaction in a particular group (lets say CURRENCY_SELL for market type 'FOREX'), the report should be populated with other tran_types from the market type group with $0 even thou this company did not have any of those transactions during current month. so in this case it should be populated with the rows
Broker1 FOREX CURRENCY_BUY $0.00 $5500000.00
and
Broker1 STOCKMARKET STOCKS_BUY $0.00 $9500000.00
The thing is that it will be executed thru plsql batch on unix, so it must be a single query.
Any ideas and/or suggestions are very appreciated!
Thanks
P.S.
Its oracle 11gr2, with read-only role.

Answer 1

Hi,
This sounds like a jo for a partitioned outer join.
Here's one way:
WITH     broker_summary     AS
     SELECT     b.company
     ,      tt.tran_type
     ,      b.curr_mnth
     ,      b.all_mnth
     FROM     broker               b
     JOIN      tran_type_cd_expl     tt  ON     WHERE     b.tran_type_cd     = tt.tran_type_cd
,     market          AS
     SELECT     'CURRENCY_SELL' AS tran_type,       'FOREX' AS market     from DUAL  UNION ALL
     SELECT     'CURRENCY_BUY',               'FOREX'           from DUAL  UNION ALL
     SELECT     'STOCKS_SELL',               'STOCKMARKET'          from DUAL  UNION ALL
,     got_market_cnt     AS
     SELECT     bs.company
     ,     m.market
     ,     m.tran_type
     ,     b.curr_mnth
     ,     b.all_mnth
     ,     COUNT (*) OVER ( PARTITION BY       bs.company
                     ,          m.market
                      )     AS market_cnt
     FROM           market          m
     LEFT OUTER JOIN     broker_summary     bs   PARTITION BY (bs.company)
                         ON   bs.tran_type     = m.tran_type
SELECT       company
,       market
,       tran_type
,       NVL (curr_mnth, 0)     AS curr_mnth
,       NVL (all_mnth,  0)     AS all_mnth
FROM       got_market_cnt
WHERE       market_cnt     > 0
ORDER BY  company
,       market
,       tran_type
;If you'd care to post a little sample data (CREATE TABLE and INSERT statements) and the results you want from that data, then I could test it.
You should create a market table. Do it once, then you won't have to do it over and over again in every query that needs it.