SQL Help: Derive "new" columns based on condition

Question

Hello all,
Can someone please help me with this ? I am trying to achieve this in a SQL ( not PL/SQL), if it can be done in two different steps, even that is fine too...
Thanks in advance,
Chandu
SELECT * FROM
SELECT 2765 BTCH_ID,'payroll' BTCH_NM,'payroll~EUR~EUR~DE'NEW_BTCH_NM,'1234'TMPLT_ID FROM DUAL
UNION
SELECT 2765,'payroll','payroll~USD~USD~US','1235' FROM DUAL
UNION
SELECT 2765,'payroll','payroll~USD~USD~US','1236' FROM DUAL
UNION
SELECT 2765,'payroll','payroll~GBP~GBP~GB','1237' FROM DUAL
UNION
SELECT 2766,'SALARY','SALARY~USD~USD~US','1238' FROM DUAL
UNION
SELECT 2766,'SALARY','SALARY~USD~USD~US','1239' FROM DUAL
) T_BATCH;For a "Batch-id" there exists multiple Transactions which are denoted by ( cr_crncy_cd , dr_crncy_cd , recvr_cntry_cd), and "NEW_BTCH_NM" column is basically a concatenation of "BTCH_NM" + above 3 columns ( with a ~)
I am trying to derive two new columns 'SEQ' & 'Output_Batch_name'
SEQ column:
For every batch_id, the first row will be assigned by sequence.nextval.
    For all transactions within BTCH_ID,
                   all the rows with same NEW_BTCH_NM, share the same sequence number
                    if different, then SEQ.nextval for all distinct rows
Output_BTCH_NM:
   for a given batch_id,
         if the NEW_BTCH_NM is the same for all transactions ( batch_id 2766 in the below example) , 
                         then Output_BTCH_NM = BTCH_NM should be marked for All transactions which belong to this Batch_id,
        Else
            Output_BTCH_NM = New_BTCH_NM
     END if
Expected OUTPUT
*BTCH_ID     BTCH_NM             NEW_BTCH_NM          TMPLT_ID     SEQ         Output_BTCH_NM*
2765       payroll                payroll~EUR~EUR~DE     1234         1          payroll~EUR~EUR~DE
2765       payroll                payroll~GBP~GBP~GB     1237         2          payroll~GBP~GBP~GB
2765       payroll                payroll~USD~USD~US     1235         3          payroll~USD~USD~US
2765       payroll                payroll~USD~USD~US     1236         3          payroll~USD~USD~US
2766       SALARY                SALARY~USD~USD~US     1238         4          SALARY
2766       SALARY                SALARY~USD~USD~US     1239         4          SALARYEdited by: user10711957 on Sep 25, 2010 4:37 PM

Answer 1

Can someone please help me with this ? I am trying to achieve this in a SQL ( not PL/SQL), if it can be done in two different steps, even that is fine too...
Thanks in advance,
Chandu
SELECT * FROM
SELECT 2765 BTCH_ID,'payroll' BTCH_NM,'payroll~EUR~EUR~DE'NEW_BTCH_NM,'1234'TMPLT_ID FROM DUAL
UNION
SELECT 2765,'payroll','payroll~USD~USD~US','1235' FROM DUAL
UNION
SELECT 2765,'payroll','payroll~USD~USD~US','1236' FROM DUAL
UNION
SELECT 2765,'payroll','payroll~GBP~GBP~GB','1237' FROM DUAL
UNION
SELECT 2766,'SALARY','SALARY~USD~USD~US','1238' FROM DUAL
UNION
SELECT 2766,'SALARY','SALARY~USD~USD~US','1239' FROM DUAL
) T_BATCH;For a "Batch-id" there exists multiple Transactions which are denoted by ( cr_crncy_cd , dr_crncy_cd , recvr_cntry_cd), and "NEW_BTCH_NM" column is basically a concatenation of "BTCH_NM" + above 3 columns ( with a ~)
I am trying to derive two new columns 'SEQ' & 'Output_Batch_name'
SEQ column:
For every batch_id, the first row will be assigned by sequence.nextval.
    For all transactions within BTCH_ID,
                   all the rows with same NEW_BTCH_NM, share the same sequence number
                    if different, then SEQ.nextval for all distinct rows
Output_BTCH_NM:
   for a given batch_id,
         if the NEW_BTCH_NM is the same for all transactions ( batch_id 2766 in the below example) , 
                         then Output_BTCH_NM = BTCH_NM should be marked for All transactions which belong to this Batch_id,
        Else
            Output_BTCH_NM = New_BTCH_NM
     END if
Expected OUTPUT
*BTCH_ID     BTCH_NM             NEW_BTCH_NM          TMPLT_ID     SEQ         Output_BTCH_NM*
2765       payroll                payroll~EUR~EUR~DE     1234         1          payroll~EUR~EUR~DE
2765       payroll                payroll~GBP~GBP~GB     1237         2          payroll~GBP~GBP~GB
2765       payroll                payroll~USD~USD~US     1235         3          payroll~USD~USD~US
2765       payroll                payroll~USD~USD~US     1236         3          payroll~USD~USD~US
2766       SALARY                SALARY~USD~USD~US     1238         4          SALARY
2766       SALARY                SALARY~USD~USD~US     1239         4          SALARY