ABAP CDS ON HANA-(7)CDSビューでの集約

Aggregate expression in CDS View

An aggregate expression calculates a single value from an operand operand by calling an aggregate function from multiple rows of a results set. They need Group By clause to aggregate values from multiple rows and  the non-aggregated fields  are specified in the GROUP BY clause.

Aggregate Functions:

Created a CDS view with below select with SUM function.

@AbapCatalog.sqlViewName: ‘ZFLIGHT_VW’
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: ‘Flight View with Aggregation Operation’
define view Zflight_View
as select from sflight
{
key sflight.carrid,
key sflight.connid,
sum( price ) as Total_Amount,
sflight.currency
} group by carrid, connid, currency

CDS view with SUM & COUNT functions

@AbapCatalog.sqlViewName: ‘ZFLIGHT_VW’
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: ‘Flight View with Aggregation Operation’
define view Zflight_View
as select from sflight
{
key sflight.carrid,
key sflight.connid,
sum( price ) as Total_Amount,
sflight.currency,
count( *) as Lines
} group by carrid, connid, currency

原文地址：https://www.cnblogs.com/yjyongil/p/10496526.html