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• AVG, AS ABAP_CDS_EXPR_V1
ABAP_CDS_DDL - DDIC-Based View, AVG, AS
ABAP_SYNTAX ... AVG( $[DISTINCT$] arg AS dtype ) ...
What does it do? Aggregate expression AVG of a ABAP_CDS_V1_VIEW with a data type dtype specified. The data type determines the result type in which the average value is returned. The same can be specified for the arg as for all aggregate expressions with one exception; CASE cannot be specified. The data type of arg must be numeric and have one of the types INT1, INT2, INT4, DEC, CURR, QUAN, or FLTP. arg can also have data type INT8, but with this data type, the addition AS is mandatory. The data type dtype can have the built-in numeric type DEC, CURR, QUAN, DECFLOAT16, DECFLOAT34, or FLTP. The data type FLTP, however, can only be specified for operands of type FLTP. The data type dtype can be specified as follows:
Using a DDIC data element with a allowed type.
Directly as a built-in data type in ABAP Dictionary. The following table shows the syntax for specifying built-in data types: <(>dtype<)>Dictionary Type abap.dec(len,decimals) DEC with length len and decimals decimal places abap.curr(len,decimals) CURR with length len and decimals decimal places abap.quan(len,decimals) QUAN with length len with decimals decimal places abap.fltp$[(16,16)$]FLTP The value range of the data type dtype must cover the value range of the operand type:
If arg is an integer type, a type dtype of type DEC , CURR, QUAN must have at least as many integer digits as is required by the value range of the respective integer type, that is, 3 for INT1, 5 for INT2, 10 for INT4, and 19 for INT8. There is no restriction on the number of decimal places.
If arg has type DEC, CURR, QUAN, a type dtype of type DEC, CURR, QUAN must have at least as many integer digits and decimal places.
If arg has type FLTP, this type must also be specified for dtype. If the average value cannot be represented exactly in the data type dtype, the result is rounded commercially.
Latest notes:
The addition AS to AVG bridges the gap for average values where FLTP cannot be cast to other numeric data types with CAST.
Since average values usually have decimal places, integer types are not supported for dtype. If necessary, the type DEC can be used without decimal places.
An aggregate expression AVG with the addition AS dtype can be used in accordance with this type in a CAST expression.
The actual calculation of the average value (determined by the involved data types) is platform-dependent. This can produce underflows, overflows, and exceptions during the calculation. To prevent exceptions, the total of the values for which the average value is being calculated should be within the value range of dtype. For further details on the calculation on SAP HANA Platform, see the SAP HANA SQL Reference Guide.
If FLTP is specified explicitly for operands of type FLTP, this ensures that the result of AVG actually has this type at each operand position, which cannot be guaranteed otherwise. NON_V5_HINTS ABAP_HINT_END
ABAP_EXAMPLE_VX5 The following CDS view demonstrates different uses of the aggregate expression AVG. The class CL_DEMO_CDS_AVG accesses the view. The average value is calculated with and without addition DISTINCT and is returned in various types. DDLS DEMO_CDS_AVG ABAP_EXAMPLE_END
