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ABAP CDS - aggr_expr

Other versions: 7.31 | 7.40 | 7.54

Syntax


... { MAX( [ALL|DISTINCT] operand ) 

    | MIN( [ALL|DISTINCT] operand ) 

    | AVG( [ALL|DISTINCT] operand [AS dtype] ) 
    | SUM( [ALL|DISTINCT] operand ) 

    | COUNT( DISTINCT operand ) 
    | COUNT(*) } ...

Effect

Aggregate expression in a SELECT statement of a 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. The following table shows the possible aggregate functions:

Aggregate Function Meaning Result Type
MAX Greatest value of operand Data type of operand
MIN Least value of operand Data type of operand
AVG Average value of operand (the operand must be numeric). TypeINT8 is only supported with addition AS dtype. The typesDF16_..., DF34_... for decimal free floating numbers are not supported. FLTP, platform-specific interim result or dtype
SUM Sum of operand (the operand must be numeric). The typesDF16_..., DF34_... for decimal free floating numbers are not supported. Data type of operand
COUNT If DISTINCT operand is specified, the number of distinct values ofoperand; if * is specified, the number of rows in the results set. INT4

If ALL is used, all rows in the results set are respected (standard setting). If DISTINCT is used, only distinct values of operand are respected.

The following can be specified for operand:

  • A field of a data source data_source of the current CDS view
  • A case distinction CASE that returns a value

The data type of the result is defined when the CDS view is activated and is determined by the aggregate function and the value range of the data types of the operands. If the result of aggregate function AVG is returned in a results set, the result type is FLTP. As the interim result in a clause, the result type can be platform-specific. With addition AS dtype, the result type can be defined for every operand position.

Aggregate expressions can be used as elements of a SELECT list. Here they need an alternative element name defined using AS and require a GROUP BY clause to be used. Aggregate expressions can be compared with literals in a HAVING condition.

The operands cannot have the type LCHR, LRAW, STRING, RAWSTRING, or GEOM_EWKB.


Notes

  • The names of the aggregate functions AVG, COUNT, MAX, MIN, and SUM are protected and cannot be used as self-defined names.

  • The result of the aggregate functions AVG in data type FLTP is platform-dependent.


Example

In the SELECT list of the CDS view sales_order, aggregate expressions calculate the sum, the minimum, and the maximum of the gross amounts of each business partner. Also, the number of requests is determined. An alternative element name is defined for each aggregation. The non-aggregated fields buyer_guid and currency_code are specified in the GROUP BY clause.

@AbapCatalog.sqlViewName: 'SALES_ORDER_VW'
define view sales_order as
  select from snwd_so
  { key buyer_guid,
       @Semantics.currencyCode
        currency_code,
       @Semantics.amount.currencyCode: 'currency_code'
        sum(gross_amount) as sum_gross_amount,
       @Semantics.amount.currencyCode: 'currency_code'
        min(gross_amount) as min_gross_amount,
       @Semantics.amount.currencyCode: 'currency_code'
        max(gross_amount) as max_gross_amount,
       @Semantics.amount.currencyCode: 'currency_code'
        avg(gross_amount) as avg_gross_amount,
        count(*) as sales_orders_count }
  group by buyer_guid, currency_code

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ABAP CDS - AVG, AS