How to remove duplicate records? Please help!

^
Dear Friends
I am new comer to this forum and had a simple SQL question. I would appreciate if anyone can help.
Many Thanx!
[email protected]
The Question:
Suppose we have some interviewers who specify the times they are available. At each interview 2 interviewers must be present.
A relation is set up to contain the available times for each interviewer, which has these fields: interviewerID, date, time. For example:
1, 14/12/04, 9:00-10:00
1, 14/12/04, 12:00-1:00
2, 12/11/04, 11:00-12:00
etc.
Then how can we write a SQL query that produces the times during which 2 interviewers are available?
A Possible Answer:
The following query produces the times during which 2 interviewers are available, however it has duplicate records:
SELECT a1.interviewerID, a2.interviewerID, a1.date, a1.time
FROM AvailabileTimes as a1, AvailableTimes as a2
WHERE a1.date = a2.date AND a1.time = a2.time AND a1.interviewerID <> a2.interviewerID
An example of the output is:
1, 2, 12/12/04, 10:00-11:00
1, 3, 14/10/03, 12:00-1:00
2, 1, 12/12/04, 10:00-11:00
etc.
where line 3 is a duplicate of line 1 (only the place of interviewerID is changed)

Thanx scott for your quick reply!!
this solves the problem for now, and is a very good idea!
But I was told this might have problems if interviewID field is later changed to something that contains letters instead of a pure numeric value e.g. staffAB-01-ZC.
Do you know what I should do to have a long term solution?

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*& Report ZCRM_TROUBLE_TICKET
REPORT zcrm_trouble_ticket.
TYPES : BEGIN OF ty_qmih,
        qmnum TYPE qmnum,
        equnr TYPE equnr,
        iloan TYPE iloan,
        ausvn TYPE ausvn,
        ausbs TYPE ausbs,
        auztv TYPE auztv,
        auztb TYPE auztb,
        iwerk TYPE iwerk,
        END OF ty_qmih,
        BEGIN OF ty_qmel,
        qmnum TYPE qmnum,
        qmtxt TYPE qmtxt,
        indtx TYPE indltx,
        priok TYPE priok,
        strmn TYPE strmn,
        strur TYPE strur,
        ltrmn TYPE ltrmn,
        ltrur TYPE ltrur,
        objnr TYPE qmobjnr,
        arbpl TYPE lgwid,
        vkorg TYPE vkorg,
        vtweg TYPE vtweg,
        spart TYPE spart,
        END OF ty_qmel,
        BEGIN OF ty_ihpa,
        parnr TYPE i_parnr,
        parvw TYPE parvw,
        objnr TYPE qmobjnr,
        END OF ty_ihpa,
        BEGIN OF ty_crhd,
        arbpl TYPE arbpl,
        objid TYPE cr_objid,
        END OF ty_crhd,
        BEGIN OF ty_crtx,
        ktext TYPE cr_ktext,
        objid TYPE cr_objid,
        END OF ty_crtx,
        BEGIN OF ty_qmfe,
        fecod TYPE fecod,
        fegrp TYPE fegrp,
        qmnum TYPE qmnum,
        END OF ty_qmfe,
        BEGIN OF ty_qmur,
        urcod TYPE urcod,
        urgrp TYPE urgrp,
        urtxt TYPE urstx,
        qmnum TYPE qmnum,
        END OF ty_qmur,
        BEGIN OF ty_iloa,
        tplnr TYPE tplnr,
        iloan TYPE iloan,
        END OF ty_iloa,
        BEGIN OF ty_output,
        qmnum TYPE qmnum,
        equnr TYPE equnr,
       iloan TYPE iloan,
        ausvn TYPE ausvn,
        ausbs TYPE ausbs,
        auztv TYPE auztv,
        auztb TYPE auztb,
        iwerk TYPE iwerk,
        qmtxt TYPE qmtxt,
        indtx TYPE indltx,
        priok TYPE priok,
        strmn TYPE strmn,
        strur TYPE strur,
        ltrmn TYPE ltrmn,
        ltrur TYPE ltrur,
       objnr TYPE qmobjnr,
       arbpl TYPE lgwid,
        vkorg TYPE vkorg,
        vtweg TYPE vtweg,
        spart TYPE spart,
        parnr TYPE i_parnr,
        parvw TYPE parvw,
        arbpl TYPE arbpl,
       objid TYPE cr_objid,
       arbpl1 TYPE arbpl,
        ktext TYPE cr_ktext,
        fecod TYPE fecod,
        fegrp TYPE fegrp,
        urcod TYPE urcod,
        urgrp TYPE urgrp,
        urtxt TYPE urstx,
        tplnr TYPE tplnr,
        END OF ty_output.
DATA : it_qmih TYPE STANDARD TABLE OF ty_qmih,
       it_qmel TYPE STANDARD TABLE OF ty_qmel,
       it_ihpa TYPE STANDARD TABLE OF ty_ihpa,
       it_crhd TYPE STANDARD TABLE OF ty_crhd,
       it_crtx TYPE STANDARD TABLE OF ty_crtx,
       it_qmfe TYPE STANDARD TABLE OF ty_qmfe,
       it_qmur TYPE STANDARD TABLE OF ty_qmur,
       it_iloa TYPE STANDARD TABLE OF ty_iloa,
       it_output TYPE STANDARD TABLE OF ty_output,
       wa_qmih TYPE ty_qmih,
       wa_qmel TYPE ty_qmel,
       wa_ihpa TYPE ty_ihpa,
       wa_crhd TYPE ty_crhd,
       wa_crtx TYPE ty_crtx,
       wa_qmfe TYPE ty_qmfe,
       wa_qmur TYPE ty_qmur,
       wa_iloa TYPE ty_iloa,
       wa_output TYPE ty_output.
INITIALIZATION.
REFRESH : it_qmih,
            it_qmel,
            it_ihpa,
            it_crhd,
            it_crtx,
            it_qmfe,
            it_qmur,
            it_iloa,
            it_output.
CLEAR:     wa_qmih,
             wa_qmel,
             wa_ihpa,
             wa_crhd,
             wa_crtx,
             wa_qmfe,
             wa_qmur,
             wa_iloa,
             wa_output.
start-of-selection.
SELECT qmnum
          equnr
          iloan
          ausvn
          ausbs
          auztv
          auztb
          iwerk
          FROM qmih
          INTO TABLE it_qmih.
SORT it_qmih BY qmnum .
DELETE ADJACENT DUPLICATES FROM it_qmih COMPARING qmnum equnr iloan ausvn ausbs auztv auztb iwerk.
SELECT   qmnum
           qmtxt
           indtx
           priok
           strmn
           strur
           ltrmn
           ltrur
           objnr
           arbpl
           vkorg
           vtweg
           spart
           FROM qmel
           INTO TABLE it_qmel
           FOR ALL ENTRIES IN it_qmih
           WHERE qmnum = it_qmih-qmnum.
SORT it_qmel BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmel COMPARING qmnum
                                                     qmtxt
                                                     indtx
                                                     strmn
                                                     strur
                                                     ltrmn
                                                     ltrur
                                                     objnr
                                                     arbpl
                                                     vkorg
                                                     vtweg
                                                     spart.
IF it_qmel IS NOT INITIAL.
    SELECT parnr
           parvw
           objnr
           FROM ihpa
           INTO TABLE it_ihpa
           FOR ALL ENTRIES IN it_qmel
           WHERE objnr = it_qmel-objnr.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_ihpa COMPARING parnr
                                                     parvw
                                                     objnr.
IF it_qmel IS NOT INITIAL.
    SELECT arbpl
           objid
           FROM crhd
           INTO TABLE it_crhd
           FOR ALL ENTRIES IN it_qmel
           WHERE objid = it_qmel-arbpl.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_crhd COMPARING arbpl
                                                     objid.
IF it_qmel IS NOT INITIAL.
    SELECT ktext
           objid
           FROM crtx
           INTO TABLE it_crtx
           FOR ALL ENTRIES IN it_crhd
           WHERE objid = it_crhd-objid.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_crtx COMPARING ktext
                                                    objid.
IF it_qmih IS NOT INITIAL.
    SELECT fecod
           fegrp
           qmnum
           FROM qmfe
           INTO TABLE it_qmfe
           FOR ALL ENTRIES IN it_qmih
           WHERE qmnum = it_qmih-qmnum.
ENDIF.
SORT it_qmfe BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmfe COMPARING fecod
           fegrp.
IF it_qmih IS NOT INITIAL.
    SELECT urcod
           urgrp
           urtxt
           qmnum
           FROM qmur
           INTO TABLE it_qmur
           FOR ALL ENTRIES IN it_qmih
           WHERE qmnum = it_qmih-qmnum.
ENDIF.
SORT it_qmur BY qmnum.
DELETE ADJACENT DUPLICATES FROM it_qmur COMPARING urcod
                                                     urgrp
                                                     urtxt.
IF it_qmih IS NOT INITIAL.
    SELECT tplnr
            iloan
            FROM iloa
            INTO TABLE it_iloa
            FOR ALL ENTRIES IN it_qmih
            WHERE iloan = it_qmih-iloan.
ENDIF.
DELETE ADJACENT DUPLICATES FROM it_iloa COMPARING tplnr
                                                    iloan.
LOOP AT it_qmih INTO wa_qmih.
    wa_output-qmnum = wa_qmih-qmnum.
    wa_output-equnr = wa_qmih-equnr.
   wa_output-iloan = wa_qmih-iloan.
    wa_output-ausvn = wa_qmih-ausvn.
    wa_output-ausbs = wa_qmih-ausbs.
    wa_output-auztv = wa_qmih-auztv.
    wa_output-auztb = wa_qmih-auztb.
    wa_output-iwerk = wa_qmih-iwerk.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_qmel INTO wa_qmel WITH KEY qmnum = wa_qmih-qmnum.
    wa_output-qmtxt = wa_qmel-qmtxt.
    wa_output-indtx = wa_qmel-indtx.
    wa_output-priok = wa_qmel-priok.
    wa_output-strmn = wa_qmel-strmn.
    wa_output-strur = wa_qmel-strur.
    wa_output-ltrmn = wa_qmel-ltrmn.
    wa_output-ltrur = wa_qmel-ltrur.
   wa_output-objnr = wa_qmel-objnr.
   wa_output-arbpl = wa_qmel-arbpl.
    wa_output-vkorg = wa_qmel-vkorg.
    wa_output-vtweg = wa_qmel-vtweg.
    wa_output-spart = wa_qmel-spart.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_ihpa INTO wa_ihpa WITH KEY objnr = wa_qmel-objnr.
    wa_output-parnr = wa_ihpa-parnr.
    wa_output-parvw = wa_ihpa-parvw.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_crhd INTO wa_crhd WITH KEY objid = wa_qmel-arbpl.
    wa_output-arbpl = wa_crhd-arbpl.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_crtx INTO wa_crtx WITH KEY objid = wa_crhd-objid.
    wa_output-ktext = wa_crtx-ktext.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_qmfe INTO wa_qmfe WITH KEY qmnum = wa_qmih-qmnum.
    wa_output-fecod = wa_qmfe-fecod.
    wa_output-fegrp = wa_qmfe-fegrp.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_qmur INTO wa_qmur WITH KEY qmnum = wa_qmih-qmnum.
    wa_output-urcod = wa_qmur-urcod.
    wa_output-urgrp = wa_qmur-urgrp.
    wa_output-urtxt = wa_qmur-urtxt.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
    READ TABLE it_iloa INTO wa_iloa WITH KEY iloan = wa_qmih-iloan.
    wa_output-tplnr = wa_iloa-tplnr.
    APPEND wa_output TO it_output.
    CLEAR wa_output.
ENDLOOP.
DELETE ADJACENT DUPLICATES FROM it_output COMPARING        qmnum
                                                              equnr
                                                              ausvn
                                                              ausbs
                                                              auztv
                                                              auztb
                                                              iwerk
                                                              qmtxt
                                                              indtx
                                                              priok
                                                              strmn
                                                              strur
                                                              ltrmn
                                                              ltrur
                                                              vkorg
                                                              vtweg
                                                              spart
                                                              parnr
                                                              parvw
                                                              arbpl
                                                              ktext
                                                              fecod
                                                              fegrp
                                                              urcod
                                                              urgrp
                                                              urtxt
                                                              tplnr.
*CALL FUNCTION 'STATUS_TEXT_EDIT'
EXPORTING
CLIENT                  = SY-MANDT
FLG_USER_STAT           = ' '
   objnr                   =
ONLY_ACTIVE             = 'X'
   spras                   = en
BYPASS_BUFFER           = ' '
IMPORTING
ANW_STAT_EXISTING       =
E_STSMA                 =
LINE                    =
USER_LINE               =
STONR                   =
EXCEPTIONS
OBJECT_NOT_FOUND        = 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.
*CALL FUNCTION 'READ_TEXT'
EXPORTING
CLIENT                        = SY-MANDT
   id                            =
   language                      =
   name                          =
   object                        =
ARCHIVE_HANDLE                = 0
LOCAL_CAT                     = ' '
IMPORTING
HEADER                        =
tables
   lines                         =
EXCEPTIONS
ID                            = 1
LANGUAGE                      = 2
NAME                          = 3
NOT_FOUND                     = 4
OBJECT                        = 5
REFERENCE_CHECK               = 6
WRONG_ACCESS_TO_ARCHIVE       = 7
OTHERS                        = 8
*IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
*ENDIF.
*LOOP AT IT_OUTPUT INTO WA_OUTPUT.
*WRITE : / WA_OUTPUT-qmnum,
         WA_OUTPUT-equnr,
         WA_OUTPUT-iloan,
         WA_OUTPUT-ausvn,
         WA_OUTPUT-ausbs,
         WA_OUTPUT-auztv,
         WA_OUTPUT-auztb,
         WA_OUTPUT-qmtxt,
         WA_OUTPUT-indtx,
         WA_OUTPUT-strmn,
         WA_OUTPUT-strur,
         WA_OUTPUT-ltrmn,
         WA_OUTPUT-ltrur,
         WA_OUTPUT-objnr,
         WA_OUTPUT-arbpl,
         WA_OUTPUT-parnr,
         WA_OUTPUT-parvw,
         WA_OUTPUT-objid,
         WA_OUTPUT-ktext,
         WA_OUTPUT-fecod,
         WA_OUTPUT-fegrp,
         WA_OUTPUT-urcod,
         WA_OUTPUT-urgrp,
         WA_OUTPUT-urtxt,
         WA_OUTPUT-tplnr.
*ENDLOOP.
CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
BIN_FILESIZE                    =
      filename                        = 'E:\CRM1.TXT'
FILETYPE                        = 'ASC'
APPEND                          = ' '
     write_field_separator           = '|'
HEADER                          = '00'
TRUNC_TRAILING_BLANKS           = ' '
WRITE_LF                        = 'X'
COL_SELECT                      = ' '
COL_SELECT_MASK                 = ' '
DAT_MODE                        = ' '
CONFIRM_OVERWRITE               = ' '
NO_AUTH_CHECK                   = ' '
CODEPAGE                        = ' '
IGNORE_CERR                     = ABAP_TRUE
REPLACEMENT                     = '#'
WRITE_BOM                       = ' '
TRUNC_TRAILING_BLANKS_EOL       = 'X'
WK1_N_FORMAT                    = ' '
WK1_N_SIZE                      = ' '
WK1_T_FORMAT                    = ' '
WK1_T_SIZE                      = ' '
WRITE_LF_AFTER_LAST_LINE        = ABAP_TRUE
IMPORTING
FILELENGTH                      =
    TABLES
      data_tab                        = it_output
FIELDNAMES                      =
EXCEPTIONS
FILE_WRITE_ERROR                = 1
NO_BATCH                        = 2
GUI_REFUSE_FILETRANSFER         = 3
INVALID_TYPE                    = 4
NO_AUTHORITY                    = 5
UNKNOWN_ERROR                   = 6
HEADER_NOT_ALLOWED              = 7
SEPARATOR_NOT_ALLOWED           = 8
FILESIZE_NOT_ALLOWED            = 9
HEADER_TOO_LONG                 = 10
DP_ERROR_CREATE                 = 11
DP_ERROR_SEND                   = 12
DP_ERROR_WRITE                  = 13
UNKNOWN_DP_ERROR                = 14
ACCESS_DENIED                   = 15
DP_OUT_OF_MEMORY                = 16
DISK_FULL                       = 17
DP_TIMEOUT                      = 18
FILE_NOT_FOUND                  = 19
DATAPROVIDER_EXCEPTION          = 20
CONTROL_FLUSH_ERROR             = 21
OTHERS                          = 22
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.

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Hi
i am removing duplicate records while importing bulk data into the table...I am checking for some columns...when they are same, i am removing the old records...i have used the following code to remove duplicates...
execute immediate 'DELETE FROM test1 WHERE ROWID IN (SELECT ROWID FROM (SELECT ROWID,ROW_NUMBER() OVER (PARTITION BY c1,c2 ORDER BY 1) row_no FROM test1)WHERE row_no > 1)';
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bulk data into the tableWhat you mean by using "while"?
During the process of importing(read inserting) - you want to delete duplicate records?
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WHERE ROWID IN (SELECT ROWID
                   FROM (SELECT ROWID,
                                ROW_NUMBER() OVER(PARTITION BY c1, c2 ORDER BY DATE_OF_ENTRY desc) row_no
                           FROM test1)
                  WHERE row_no > 1)

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How to avoid Duplicate Records while joining two tables

Hi,
I am trying to join three tables, basically two tables are same one is like history table, so I wrote a query like
select
e.id,
e.seqNo,
e.name,
d.resDate,
d.details
from employees e,
((select * from dept)union(select * from dept_hist)) d
join on d.id=e.id and e.seqno=d.seqno
but this returing duplicate records.
Could anyone please tell me how to avoid duplicate records of this query.

Actually it is like if the record is processed it will be moved to hist table, so both table will not have same records and I need the record from both the tables so i have done the union of both the tables, so d will have the union of both records.
But I am getting duplicate records if even I am distinct.

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Read this, it explains how you could have set restrictions and avoided this situation:
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How to remove duplicate records? Please help!

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