I've to extract the data based on the sysdate...like today dd is 11,

Question

BM_PERF is the table name and
BM_PERF_YR,BM_PERF_MONTH,BM_NOP_CT_1........BM_NOP_CT_31 are the column names.
I've to extract the data based on the sysdate...like today dd is 11
so i've to get data from BM_NOP_CT_11 and the column names changes dynamically based on the sysdate. don't use any procedures and functions.

Answer 1

You could always pivot it into a more convenient form for querying:
WITH t1 AS
     ( SELECT 2008 AS yr, 4 AS mnth
            , 20 AS dy1
            , 10 AS dy2
            , 15 AS dy3
            , 1  AS dy4
            , 17 AS dy5
            , 99 AS dy6
            , 55 AS dy7
            , 45 AS dy8
            , 33 AS dy9
            , 22 AS dy10
            , 74 AS dy11
            , 35 AS dy12
            , 62 AS dy13
            , 24 AS dy14
            , 85 AS dy15
       FROM dual )
   , t2 AS
     ( SELECT yr
            , mnth
            , sys.DBMS_DEBUG_VC2COLL
              (dy1,dy2,dy3,dy4,dy5,dy6,dy7,dy8,dy9,dy10,dy11,dy12,dy13,dy14,dy15)
              AS day_data
       FROM   t1 )
SELECT t2.yr, t2.mnth, sys_op_ceg(t2.day_data,5) day_value
FROM   t2;
        YR       MNTH DAY_VALUE
      2008          4 17
1 row selected.Note that SYS_OP_CEG (first discovered by Padders) is undocumented and unsupported - for production code you'd need to pick the collection row using a WHERE clause, and for that you'd need a custom object and collection type with an attribute to hold the day number.
Message was edited by:
William Robertson
...like this:
CREATE TYPE id_value_ot AS OBJECT
( id INTEGER, val NUMBER );
CREATE TYPE id_value_tt AS TABLE OF id_value_ot ;
WITH t1 AS
     ( SELECT 2008 AS yr, 4 AS mnth
            , 20 AS dy1
            , 10 AS dy2
            , 15 AS dy3
            , 1  AS dy4
            , 17 AS dy5
            , 99 AS dy6
            , 55 AS dy7
            , 45 AS dy8
            , 33 AS dy9
            , 22 AS dy10
            , 74 AS dy11
            , 35 AS dy12
            , 62 AS dy13
            , 24 AS dy14
            , 85 AS dy15
       FROM dual )
   , t2 AS
     ( SELECT yr
            , mnth
            , id_value_tt
              ( id_value_ot(1,dy1)
              , id_value_ot(2,dy2)
              , id_value_ot(3,dy3)
              , id_value_ot(4,dy4)
              , id_value_ot(5,dy5)
              , id_value_ot(6,dy6)
              , id_value_ot(7,dy7)
              , id_value_ot(8,dy8)
              , id_value_ot(9,dy9)
              , id_value_ot(10,dy10)
              , id_value_ot(11,dy11)
              , id_value_ot(12,dy12)
              , id_value_ot(13,dy13)
              , id_value_ot(14,dy14)
              , id_value_ot(15,dy15) )
              AS day_data
       FROM   t1 )
SELECT yr, mnth, dd.val
FROM   t2, TABLE(t2.day_data) dd
WHERE  dd.id = 5;
        YR       MNTH        VAL
      2008          4         17
1 row selected.