Create Internal table with fields coming as query result of multiple tables

Hi
I want to create internal table with the fileds which come as a result of a select query from multiple tables

My code is something like this. I need the data from various fields of diff tables depending on the excel file. This data is then to be put in a internal table
*& Report Z_EXTC
report z_extc.
type-pools : abap.
parameter: objname(25) type c.
data : idetails type abap_compdescr_tab,
       xdetails type abap_compdescr.
data : ref_table_des type ref to cl_abap_structdescr.
data: p_table type string.
data:l_string type string,
     l_filename(200) type c,
     dy_line type ref to data,
     xfc type lvc_s_fcat,
     ifc type lvc_t_fcat.
types:begin of itab,
     tabname type dd03l-tabname,
     fieldname type dd03l-fieldname,
     end of itab.
types:begin of atab,
      tabname type dd03l-tabname,
      cnt type string,
      end of atab.
field-symbols: <dyn_table> type table,
               <dyn_table1> type standard table,
               <dyn_wa>,
               <dyn_field>.
data: dy_table type ref to data,
      dy_table1 type ref to data.
data: itab1 type itab occurs 0 with header line.
data atab1 type atab occurs 0 with header line.
data frstrec type i value 0.
data lastrec type i value 0.
l_string = ''.
call function 'GUI_UPLOAD'
exporting
    filename                      = 'C:\excel_files\FIELDS_CC.TXT'
   filetype                      = 'TXT'
   has_field_separator           = 'X'       .
if sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
endif.
*Refresh itab1.
loop at itab1.
on change of: itab1-tabname.
    if lastrec = 1.
      move l_string to atab1-cnt.
   move itab1-tabname to atab1-tabname.
      append atab1.
      l_string = ''.
    endif.
    move itab1-tabname to atab1-tabname.
    frstrec = 1.
endon.
if frstrec = 1.
    concatenate l_string itab1-fieldname into l_string separated by
space.
    lastrec = 1.
endif.
*write:/ itab1-tabname,40 itab1-fieldname.
endloop.
move l_string to atab1-cnt.
append atab1.
loop at atab1.
write:/ atab1-tabname,5 atab1-cnt.
endloop.

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