Group by in detail - Open SQL Enhancement ABAP on HANA - Part 11


*&---------------------------------------------------------------------*
*& Report zr_opensql_20_unioon_grp_by
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT zr_opensql_20_unioon_grp_by.
*Use case only n select list
*Use case in select list and grp by
*Chaining operator
*demo_sql_expr_with_group_by

SELECT
 FROM vbak AS so
 INNER JOIN kna1 AS cust
 ON so~kunnr = cust~kunnr
 FIELDS so~kunnr AS cust_id,
        cust~name1 AS customer,
        so~waerk AS curre,
        SUM( so~netwr ) AS tot_netprice,
*        AVG( so~netwr ) AS net,
*        MAX( so~netwr ) AS max,
*        MIN( so~netwr  ) AS min,
        COUNT( so~netwr ) AS count,
      CASE
         WHEN so~netwr > 1000 THEN 'Higher amount document'
         WHEN ( so~netwr ge 500 AND so~netwr le 1000 ) THEN 'Medium amount'
         ELSE  'Lower amount'
         END AS amount_category
 GROUP BY so~kunnr,so~waerk,
         CASE
         WHEN so~netwr > 1000 THEN 'Higher amount document'
         WHEN ( so~netwr ge 500 AND so~netwr le 1000 ) THEN 'Medium amount'
         ELSE  'Lower amount'
         END,
         cust~name1
 HAVING SUM( so~netwr ) > 1000
 INTO TABLE @DATA(it_result).
IF sy-subrc IS INITIAL.
  cl_demo_output=>display( it_result ).
ENDIF.


*->The order of the SQL expressions / fields within
*the comma-separated list is not important


*->Columns not specified after GROUP BY
*can only be specified after SELECT as the argument of
*an aggregate function of an aggregate expression

*->◾If GROUP BY is used, the statement SELECT bypasses table buffering.

*->◾Using GROUP BY and aggregate functions ensures that
*aggregates and groups are assembled by the database system,
* not AS ABAP.
*This can considerably reduce the volume of data that has to be transported
*from the database to AS ABAP.
**********************************************************************

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