Sum (query directive)

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Description

Returns the sum of values of active column.

Constructor

Sum(Directive directive)

Examples

Following example sums the number of instances of each instances. 

importPackage(org.wandora.query2);
new Sum(
  new Count(new Instances())
  .from(new Instances())
)

Note that you can do the same thing easier without the Sum. 

importPackage(org.wandora.query2);
new Count(new Instances().from(new Instances()))
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