Dynamic table name in select statment

hai,
Please help me....
oracle 9i i am using.
i have four tables abc_121,
abc_122,
abc_123,
abc_124.
i want to pick records from a table.table name should be prepared dynamically.
i.e., i want to pick records from a quarter table of this year.(ex: abc_124). using sql statement only.
i have tried..but i couldn't...... pls help me...

ramadurga.v wrote:
oracle 9i i am using.
i have four tables abc_121,
abc_122,
abc_123,
abc_124.
i want to pick records from a table.table name should be prepared dynamically.
i.e., i want to pick records from a quarter table of this year.(ex: abc_124). using sql statement only.Create a partition view. E.g.
create or replace view abc as
select * from abc_121
union all
select * from abc_122
union all
...For the partition view approach to correctly work (doing "partition pruning"), you need to have a constraint on the column that identifies that partition.
In other words, you cannot use the table name as an attribute to identifies its data content. Foe example, you can have tables YEAR2001_Q1 and YEAR2001_Q2. However, the year and quarter also need to be in the table itself - e.g. columns YEAR and QUARTER.
For table YEAR2001_Q1, the YEAR column needs to have a check constraint that ensures it is always 2001. And a check constraint for column QUARTER to ensure that it is always 1.
If these conditions are met, then a select from the partition view using +"where YEAR=2001 and QUARTER=2"+ will result in only table YEAR2001_Q2 to be used and not other tables like YEAR2001_Q1.
See {message:id=10539404} for an example.

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    Check this link.
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    Hi,
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    assign lx_struct->* to <fs>.
    *Get the field structure
    lcl_sdescr ?= cl_abap_typedescr=>describe_by_data( <fs> ).
    loop at lcl_sdescr->components assigning <components>.
    *Do not display field "MANDT"
       IF sy-tabix = 1 AND <components>-name = 'MANDT'.
         CONTINUE. "next loop
       ENDIF.
    *Build fieldcatalog
       lx_lvc_cat-fieldname = <components>-name.
       lx_lvc_cat-ref_table = p_table.
       append lx_lvc_cat to lt_lvc_cat.
       lx_fieldcat-fieldname   = <components>-name.
       lx_fieldcat-ref_tabname = p_table.
       append lx_fieldcat to lt_fieldcat.
    endloop.
    *Create an internal table
    call method cl_alv_table_create=>create_dynamic_table
    exporting it_fieldcatalog = lt_lvc_cat
    importing ep_table        = lt_table.
    assign lt_table->* to <lt_table>.
    *Read the data
        select * from (p_table)
       into corresponding fields of table <lt_table>
       order by primary key.
      loop at <lt_table> assigning <fs_line>.
      assign component 'MANDT' of
             structure <fs_line> to <fs_field>.
          <fs_field> = p_mandt.
      endloop.
    if <lt_table>[] is initial.
    *No table enties are existing
       message e003(zdynamictable) with p_table.
       exit.
    else.
       describe table <lt_table>[] lines total_rows.
       t_rows = total_rows.
       shift t_rows left deleting leading space.
    endif.
    *Specify the layout
    lx_layout-zebra = 'X'.
    lx_layout-colwidth_optimize = 'X'.
    *Display the ALV List
    select single ddtext into table_desc from dd02t
    where tabname eq p_table and ddlanguage eq c_language.
    check not table_desc is initial.
    concatenate  'Entries from table:'
    p_table '(' table_desc ')' '-:' t_rows 'Entries Found' into
    table_desc
    separated by space.
    *Start - Download the data to excel sheet by validating the file path.
    data:
    *lv_filename type string,
    lv_fname_validate like rlgrap-filename.
    *CONCATENATE 'C:\ZTABLE_DWN\' P_TABLE '.Xls' INTO LV_FILENAME.
    *CONCATENATE '
    Pc-p31061\Harman\Tasks\ZTABLE_DWN\' P_TABLE '.xls' INTO
    CONCATENATE 'C:\ZTABLE_DWN\' P_TABLE '.xls' INTO
    LV_FNAME_VALIDATE.
    call function 'WS_FILE_DELETE'
    exporting
       file          = lv_fname_validate
    IMPORTING
      RETURN        =
    CALL FUNCTION 'WS_DOWNLOAD'
    EXPORTING
      BIN_FILESIZE                  = ' '
      CODEPAGE                      = ' '
      FILENAME                      =  LV_FNAME_VALIDATE
      FILETYPE                      = 'DAT'
    IMPORTING
      FILELENGTH                    =
    TABLES
       DATA_TAB                      = <lt_table>.
    *call function 'GUI_DOWNLOAD'
    exporting
      BIN_FILESIZE                  =
       filename                      = lv_fname_validate
      filetype                      = 'ASC'
      write_field_separator           =  'X'
    IMPORTING
      FILELENGTH                    =
    tables
       data_tab                      = <lt_table>.
    End of Download.
    call function 'REUSE_ALV_GRID_DISPLAY'
      exporting
        i_background_id                   = 'ALV_BACKGROUND'
        i_grid_title                      = table_desc
        is_layout                         = lx_layout
        it_fieldcat                       = lt_fieldcat
       tables
         t_outtab                          = <lt_table>
      exceptions
        program_error                     = 1
        others                            = 2
    if sy-subrc <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
    endif.
    clear table_desc.
    endform.                    " table_data_display

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