Issue with query to find the lag data

Question

Hello PL/SQL Gurus/Experts,
I am not able to extract the data with the following table structure -
drop table T2;
create table T2(Stream, Trade, Fees) as select
'MECHNICAL', 'Primary', '5534500' from dual union all select
'ELECTRICAL', 'Secondary', '5285500' from DUAL union all select
'MECHNICAL', 'Secondary', '2364535' from dual union all select
'ELECTRICAL', 'Primary', '1734540' from DUAL union all select
'MBE', 'Secondary', '3424500' from dual union all select
'ELECTRONICS', 'Primary', '5004567' from DUAL union all select
'ELECTRONICS', 'Secondary', '4543200' from DUAL union all select
'COMPUTERS', 'Secondary', '5534500' from DUAL union all select
'CIVIL', 'Primary', '2345500' from DUAL union all select
'CIVIL', 'Secondary', '4456500' from DUAL union all select
'COMPUTERS', 'Primary', '9542500' from DUAL;I want to extract the data in following format -
Stream          Trade          Fees
MECHNICAL     Primary          5534500
          Secondary          2364535
ELECTRICAL     Primary          1734540
          Secondary       5285500
ELECTRONICS     Primary          5004567
          Secondary        4543200
CIVIL          Primary          2345500
          Secondary         4456500
MBE          Primary     
          Secondary       3424500
Total                    34693342Now if if i am using the following query -
SELECT CASE WHEN LAG(Stream||Trade) OVER (ORDER BY Stream, Trade, Fees) = Stream||Trade THEN NULL ELSE Stream END Stream
     , CASE WHEN LAG(Stream||Trade) OVER (ORDER BY Stream, Trade, Fees) = Stream||Trade THEN NULL ELSE Trade END Trade
     , CASE WHEN LAG(Fees) OVER (partition by Stream||Trade ORDER BY Stream, Trade, Fees) = Fees THEN NULL ELSE Fees END Fees
FROM (     select distinct Stream, Trade, Fees from T2 ORDER BY Stream, Trade, Fees);
SELECT  NVL2(LAG(Trade) OVER (PARTITION BY Stream, Trade ORDER BY Stream, Trade, Fees),Null,Trade) Trade,
     NVL2(LAG(Stream) OVER (PARTITION BY Stream, Trade ORDER BY Stream, Trade, Fees),Null,Stream) Stream,
     Fees
from (select distinct Stream, Trade, Fees from T2)Kindly help me ...
Thank you all for your time and effort in advance.

Answer 1

This way!!!
select a.stream2 stream, trade, sum(fees)
  from (
        select case row_number() over(partition by stream order by trade)
        when 1 then stream
        else 'Unknown' end stream2,trade, fees
        from t2
        order by stream, trade
       ) a
where a.stream2 != 'Unknown'
group by a.stream2, trade;
STREAM      TRADE     SUM(FEES)             
ELECTRICAL  Primary   1734540               
MECHNICAL   Primary   5534500               
COMPUTERS   Primary   9542500               
MBE         Primary                         
ELECTRONICS Primary   5004567               
CIVIL       Primary   2345500PS:- Use instead of {CODE}
Also, use != instead of <> while pasting the code on Forum. <> is converted to NULL or probably ignored.