MarkLogic 10 Product Documentationop:named-group
op:named-group( $name as xs:string, [$columns as columnIdentifier*] ) as map:map
Summary
This function specifies the grouping keys for a group as a named list of zero or more columns. The result is used for building the first parameter for the op:group-to-arrays function.
| Parameters | |
|---|---|
| $name | The name for the list of grouping keys. |
| $columns | The columns (if any) to use as grouping keys. The columns can be named with a string or a column parameter function such as op:col or constructed from an expression with op:as. |
See Also
Example
xquery version "1.0-ml";
import module namespace op="http://marklogic.com/optic"
at "/MarkLogic/optic.xqy";
op:from-view("main", "expenses")
=> op:group-to-arrays(
(op:named-group('total'), op:named-group('byCategoryLocation', ("Category", "Location"))),
op:sum("TotalAmount", "Amount"))
=> op:result()