Sum

aggregation-functions sum

syntax

• sum(a)
• sum(a, relation)

• sum_x(a) or sum_x(a, relation) where x in {(

  u)int(8

  16

  32

  64), float64, (i

  u

  d)point }

definition

• sum(a) results in a parameter with the sum of the non null values of attribute a.
• sum(a, relation) results in an attribute with the sum of the non null values of attribute a, grouped by relation. The domain-unit of the resulting attribute is the values-unit of the relation.
• sum_x(a) or sum_x(a, relation) results in an attribute with the sum of the non null values of attribute a, optionally grouped by relation with as resulting value-type the value type x.

applies to

• attribute a with Numeric value-type
• relation with value type of the group CanBeDomainUnit

conditions

1. The values unit of the resulting data item should match with regard to value type and metric with the values unit of attribute a.
2. The domain unit of argument a and relation must match.

example

parameter<uint32>  sumNrInh                := sum(City/NrInhabitants); result = 2250
parameter<float64> sum_float64NrInh        := sum_float64(City/NrInhabitants); result = 2250 as float64
attribute<uint32>  sumNrInhRegion (Region) := sum(City/NrInhabitants, City/Region_rel);

domain City, nr of rows = 7

domain Region, nr of rows = 5