How to get the desired output

My Table Data
ContractID     MaterialGroup      CommodityCode     Amount
C123      Travel     200     100
C123      Travel     201     100
C123             Travel     203     100
C124            Stationery     315     500
C126            Travel             200     600
C126            Admin             413     600
My expected output
ContractID     MaterialGroup      CommodityCode     Amount
C123        Travel             200|201|203     100
C124             Stationery             315                     500
C126            Travel|Admin     200|413           600
My Present Output
CONTRACTID MATERIALGROUP    COMMODITYCODE AMOUNT
C123            Travel|Travel|Travel 200|203|201        100
C124            Stationery               315                     500
C126            Travel|Admin           200|413               600
My Query:
SELECT ContractID,
RTrim(
              xmlagg(
                      xmlelement(e, MaterialGroup|| '|')).extract('//text()'),'|') MaterialGroup,
RTrim(
              xmlagg(
                      xmlelement(e, CommodityCode|| '|')).extract('//text()'),'|') CommodityCode,Amount
FROM (
WITH t1 AS (
SELECT 'C123' ContractID,     'Travel'MaterialGroup,      200     CommodityCode, 100 Amount FROM dual UNION all
SELECT 'C123',            'Travel',     201,     100 FROM dual UNION all
SELECT 'C123',            'Travel',     203,     100 FROM dual UNION all
SELECT 'C124','Stationery',     315,     500 FROM dual UNION all
SELECT 'C126','Travel',     200,     600 FROM dual UNION all
SELECT 'C126','Admin',413,     600 FROM dual)
SELECT * FROM t1)
GROUP BY ContractID,Amount;

select t.*,
        case when cdm = 1 and cm > 1
                then substr(materialgroup,1, instr(materialgroup,'|', cdm)-1)
                else materialgroup end materialgroup_edit,
         case when cdm = 1 and cm > 1 then mm else materialgroup end materialgroup_edit2
from
          select contractid,
          count(materialgroup) cm,
          count(distinct materialgroup) cdm,
          max(materialgroup) mm,
          rtrim(
                      xmlagg(
                              xmlelement(e, materialgroup|| '|')).extract('//text()'),'|') materialgroup,
          rtrim(
                      xmlagg(
                              xmlelement(e, commoditycode|| '|')).extract('//text()'),'|') commoditycode,amount
        from (
        with t1 as (
        select 'C123' contractid,    'Travel' materialgroup,     200    commoditycode, 100 amount from dual union all
        select 'C123',            'Travel',    201,    100 from dual union all
        select 'C123',            'Travel',    203,    100 from dual union all
        select 'C124','Stationery',    315,    500 from dual union all
        select 'C126','Travel',    200,    600 from dual union all
        select 'C126','Admin',413,    600 from dual )
        select * from t1)
        group by contractid,amount
        ) t;
CONTRACTID         CM        CDM MM         MATERIALGROUP        COMMODITYCODE            AMOUNT MATERIALGROUP_EDIT   MATERIALGROUP_EDIT2
C123                3          1 Travel     Travel|Travel|Travel 200|203|201                 100 Travel               Travel
C124                1          1 Stationery Stationery           315                         500 Stationery           Stationery
C126                2          2 Travel     Travel|Admin         200|413                     600 Travel|Admin         Travel|Admin
3 rows selected.
select contractid,
          case when count(distinct materialgroup) = 1 and count(materialgroup) > 1 then max(materialgroup)
          else
          rtrim(
                      xmlagg(
                              xmlelement(e, materialgroup|| '|')).extract('//text()'),'|') end materialgroup,
          rtrim(
                      xmlagg(
                              xmlelement(e, commoditycode|| '|')).extract('//text()'),'|') commoditycode,amount
        from (
        with t1 as (
        select 'C123' contractid,    'Travel' materialgroup,     200    commoditycode, 100 amount from dual union all
        select 'C123',            'Travel',    201,    100 from dual union all
        select 'C123',            'Travel',    203,    100 from dual union all
        select 'C124','Stationery',    315,    500 from dual union all
        select 'C126','Travel',    200,    600 from dual union all
        select 'C126','Admin',413,    600 from dual )
        select * from t1)
        group by contractid,amount;
CONTRACTID MATERIALGROUP        COMMODITYCODE            AMOUNT
C123       Travel               200|203|201                 100
C124       Stationery           315                         500
C126       Travel|Admin         200|413                     600
3 rows selected.
with t1 as (
        select 'C123' contractid,    'Travel' materialgroup,     200    commoditycode, 100 amount from dual union all
        select 'C123',            'Travel',    201,    100 from dual union all
        select 'C123',            'Travel',    203,    100 from dual union all
        select 'C124','Stationery',    315,    500 from dual union all
        select 'C126','Travel',    200,    600 from dual union all
        select 'C126','Admin',413,    600 from dual ),
        t2 as
        select contractid, materialgroup
        from t1
        group by contractid, materialgroup
select t1.contractid,
          t2.materialgroup,
          rtrim(
                      xmlagg(
                              xmlelement(e, commoditycode|| '|')).extract('//text()'),'|') commoditycode,amount
from t1,
                select contractid,
                            rtrim(
                                  xmlagg(
                                          xmlelement(e, materialgroup|| '|')).extract('//text()'),'|') materialgroup
                from t2
                group by contractid
                ) t2
where t1.contractid = t2.contractid
group by t1.contractid, t2.materialgroup, t1.amount;
CONTRACTID MATERIALGROUP        COMMODITYCODE            AMOUNT
C123       Travel               200|203|201                 100
C124       Stationery           315                         500
C126       Admin|Travel         200|413                     600
3 rows selected.

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                 100 17-JUN-1987 00:00:00
                 101 21-SEP-1989 00:00:00
                 102 13-JAN-1993 00:00:00
                 103 03-JAN-1993 00:00:00
                 104 21-MAY-1991 00:00:00
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                 143 15-MAR-1998 00:00:00
                 144 09-JUL-1998 00:00:00
                 149 29-JAN-2000 00:00:00
                 174 11-MAY-1996 00:00:00
                 176 24-MAR-1998 00:00:00
                 178 24-MAY-1999 00:00:00
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Table 1                                        Table 2
EmpCode   EmpName       EmpCode EmpPhone
10001         ABC                    10001   12345
10002         BCD                    10001   23456
10003         CDE                    10001   34567
10004         EFG                     10006   45678
10005         FGH                     10007   56789
10006         GHI                     10007   67890
10007         HIJ                      10010   78901
10008         IJK                      10010   89012
10009         JKL                     10010   90123
10010         KLM                    10011   13579
10011         LMN                    10012   35791
10012         MNO                   10012   57913
10013         NOP                   10012   79135
10014         OPQ                   10017   91357
10015         PQR                    10017   12390
10016         QRS                    10019   23479
10017         RST
10018         STU
10019         TUV
output
EmpCode   EmpName   EmpPhone
10001           ABC             12345/23456/34567
10002           BCD
10003          CDE
10004      EFG
10005          FGH
10006         GHI            45678
10007         HIJ           56789/67890
10008         IJK
10009         JKL
10010         KLM       78901/89012/90123
10011         LMN      13579
10012         MNO       35791/57913/79135
10013         NOP
10014        OPQ
10015      PQR
10016       QRS
10017       RST   91357/12390
10018       STU
10019       TUV      23479


Srimanta,
Check this:
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from Table1 t1
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group by t1.EmpCode,t1.EmpName
Edited : small change in code(highlighted - t1 instead of t2)
Thanks,
Jay
<If the post was helpful mark as 'Helpful' and if the post answered your query, mark as 'Answered'>

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please help me! Thank you in advance!
my main code are below:
Process ps=Runtime.getRuntime().exec("xxx.exe");/*xxx.exe is a executable program which will generate a console with the message I want to gain.*/
int exitVal= ps.waitFor();
if(exitVal==0){
BufferredReader br = new BufferedReader(new InputStreamReader(ps.getInputStream())); String st;
while((st = br.readLine()) !=null){
System.out.println("write:"+st);
}//my result show that I got nothing from the progam.
}

I've seen this kind of problem with an offending xxx.exe. Generally it means that the program isn't flushing its output immediately, so your java program never sees it.

How to get the desired output

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