Need help in fetching data based on date

Question

i want to  write the query for the below statements ?
1) net_bank_cr from rm_memorandum for the previous year end 31st March
2) net_bank_cr from rm_memorandum for the as on date
3) net_bank_cr from rm_memorandum as one year prior to current reporting date
The table structure of rm_memorandum is as given below:
create table RM_MEMO
AS_ON_DT DATE,
PAID_CAPITAL NUMBER(20,2),
TOTAL_OBE NUMBER(20,2),
CR_EQI_OBE NUMBER(20,2),
NET_BANK_CR NUMBER(20,2),
ADJ_NET_BANK_CR NUMBER(20,2),
DEP_CURREMT_CRR NUMBER(20,2),
LIAB_OTH_CRR NUMBER(20,2),
TOTAL_CRR NUMBER(20,2)
)

Answer 1

may be like ..
WITH t AS
     (SELECT TO_DATE ('31/12/2010', 'dd/mm/yyyy') as_on_dt, 205 net_bank_cr
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('15/03/2011', 'dd/mm/yyyy'), 205
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('15/03/2011', 'dd/mm/yyyy'), 666
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('31/03/2011', 'dd/mm/yyyy'), 9856
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('31/03/2011', 'dd/mm/yyyy'), 521
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('05/04/2011', 'dd/mm/yyyy'), 20
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('07/05/2011', 'dd/mm/yyyy'), 965
        FROM DUAL)
SELECT *
  FROM t
WHERE t.as_on_dt
          BETWEEN   (CASE
                        WHEN (SYSDATE >
                                 ADD_MONTHS (TRUNC (t.as_on_dt, 'YYYY'), 3)
                                 - 1
                           THEN   ADD_MONTHS (TRUNC (ADD_MONTHS (SYSDATE, -12),
                                                     'YYYY'
                                              3
                                - 1
                        WHEN (SYSDATE <=
                                 ADD_MONTHS (TRUNC (t.as_on_dt, 'YYYY'), 3)
                                 - 1
                           THEN   ADD_MONTHS (TRUNC (ADD_MONTHS (SYSDATE, -24),
                                                     'YYYY'
                                              3
                                - 1
                     END
                  + 1                    -- plus 1 to ensure it is the 1st Apr
              AND CASE
          WHEN (SYSDATE > ADD_MONTHS (TRUNC (t.as_on_dt, 'YYYY'), 3) - 1)
             THEN ADD_MONTHS (TRUNC (SYSDATE, 'YYYY'), 3) - 1
          WHEN (SYSDATE <= ADD_MONTHS (TRUNC (t.as_on_dt, 'YYYY'), 3) - 1)
             THEN ADD_MONTHS (TRUNC (ADD_MONTHS (SYSDATE, -12), 'YYYY'), 3)
                  - 1
       ENDand result would be ....
AS_ON_DT  NET_BANK_CR
31-DEC-10         205
15-MAR-11         205
15-MAR-11         666
31-MAR-11        9856
31-MAR-11         521regards,
friend