MarkLogic 9 Product Documentation

op:sequence-aggregate

op:sequence-aggregate(
   $outCol as item(),
   $inCol as item(),
   [$options as map:map?]
) as map:map

Summary

This call constructs a sequence whose items are the values of a column for each row in the group or row set. The result is used for building the parameters used by the op:group-by function.

Example

xquery version "1.0-ml";

import module namespace op="http://marklogic.com/optic"
     at "/MarkLogic/optic.xqy";

let $expenses := op:from-view("main", "expenses")
 
return $expenses
    => op:group-by("Category", op:sequence-aggregate("Sequence Array", "Amount"))           
    => op:order-by("Category")
    => op:result()