Tuesday, July 28, 2015

Select Distinct

Select distinct only selects the unique entries of the fields in the select statement. It will not allow any duplicate entry into the internal table. In the below example we are having a selection screen where we are defining a selection range of PO number by select option. At first we are fetching the records with normal select statement and we find six records from the database.

REPORT  zabap_gui.

TABLES: ekpo.

* Creating a custom structure of Item Table
TYPES:
      BEGIN OF ty_ekpo,
        ebeln TYPE ekpo-ebeln,
        ebelp TYPE ekpo-ebelp,
        matnr TYPE ekpo-matnr,
        werks TYPE ekpo-werks,
        lgort TYPE ekpo-lgort,
      END OF ty_ekpo.

* Creating a line type of predefined structure
DATA:
      wa_ekpo TYPE ty_ekpo,
      it_ekpo TYPE STANDARD TABLE OF ty_ekpo.

SELECT-OPTIONS: s_ebeln FOR ekpo-ebeln.

SELECT ebeln ebelp matnr werks lgort
  FROM ekpo INTO TABLE it_ekpo
  WHERE ebeln IN s_ebeln.

WRITE:/    'PO No.',
        15 'Item No',
        28 'Material',
        48 'Plant',
        55 'Storage'.
ULINE.
SKIP.

LOOP AT it_ekpo INTO wa_ekpo.
  WRITE:/    wa_ekpo-ebeln,
          15 wa_ekpo-ebelp,
          28 wa_ekpo-matnr,
          48 wa_ekpo-werks,
          55 wa_ekpo-lgort.
ENDLOOP.

Selection Range with select option:











The output is:




















Now with the similar selection range we use select distinct statement and we are getting only three records. This is because we have selected only the PO number in select statement with distinct clause. Now distinct will not allow any duplicate entry of PO number.

REPORT  zabap_gui.

TABLES: ekpo.

* Creating a custom structure of Item Table
TYPES:
      BEGIN OF ty_ekpo,
        ebeln TYPE ekpo-ebeln,
      END OF ty_ekpo.

* Creating a line type of predefined structure
DATA:
      wa_ekpo TYPE ty_ekpo,
      it_ekpo TYPE STANDARD TABLE OF ty_ekpo.

SELECT-OPTIONS: s_ebeln FOR ekpo-ebeln.

SELECT DISTINCT ebeln
  FROM ekpo INTO TABLE it_ekpo
  WHERE ebeln IN s_ebeln.

WRITE:/    'PO No.'.
ULINE.
SKIP.

LOOP AT it_ekpo INTO wa_ekpo.
  WRITE:/    wa_ekpo-ebeln.
ENDLOOP.

Hence the output is as follows.



Here we know that one PO can have multiple items. Hence in database table EKPO the PO entries are having duplicate entries for different items. But selecting the PO number with distinct clause will fetch only the unique PO number from the database. If we select here the item also with the distinct clause the SAP system will treat both of those fields as unique. In that case the system will recognize PO number and corresponding item number is the unique. In this way if we increase the fields in selection the system will give uniqueness according to the combination of all those selected fields.


16 comments:

Anonymous said...

MR. SANDIP ROY,

As I always tell you your blog is excellent.

I have one small doubt regarding to select distinct.
what is the difference between select distinct and delete adjacent duplicates.

cant we use below statement instead of select distinct.

sort it_ekpo.
delete adjacent duplicates from it_ekpo comparing ebeln ebelp.

Regards,
kumar.

Anonymous said...

hello,

it should be

select-options: s_ebeln for wa_ekpo-ebeln.

Mahesh Sangupally said...

Hello,
IF THERE ARE 100 RECORDS IN MY DATABASE TABLE IN THAT 10 DUPLICATE RECORDS ARE THERE ,
when we use
SELECT DISTINCT FROM INTO WHERE XX = P_XX.

WHICH RECORD WILL FETCH FROM DATABASE (I.E... TOP MOST RECORD OR LAST RECORD IN THAT DUPLICATE DATA).

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ARUN MAHEEDHAR VIJAYASEKARAN said...

Here Select DISTINCT Operation will happen in the Database Layer while fetching the data itself it'll take the unique entries (performance LVL- Best)

But Delete Adjacent Duplicates are Internal table operations it'll fetch the records from the Database layer to Application layer and it'll delete the duplicate. Since you'll come to know which is the best (Performance LVL - AVG)