sum

syntax

• sum(a)
• sum(a, relation)

definition

1. sum(a) results in a parameter with the sum of the non null values of attribute a.
2. sum(a, relation) results in an attribute with the sum of the non null values of attribute a, grouped by the relation attribute.The domain unit of the resulting attribute is the values unit of the relation attribute.

applies to

Attribute a with Numeric value type
Relation attribute with value type of the group CanBeDomainUnit

conditions

The values unit of the resulting data item should match with regard to value type and metric with the values unit of attribute a.

The domain of argument a and relation must match.

since version

5.15

example:

parameter<uint32> sumNrInh := sum(City/NrInhabitants); result = 2250
attribute<uint32> sumNrInhRegion (Region)
:= sum(City/NrInhabitants, City/Region_rel);

City/NrInhabitants	City/Region_rel
550	0
525	1
300	2
500	1
200	3
175	null
null	3

domain City, nr of rows = 7

sumNrInhRegion

550

1025

300

200

0

domain Region, nr of rows = 5