Daanse Tutorial - Cube Measure Aggregator Nth

Data cubes have NTH measures.

Database Schema

The cube defined in this example is based on a single table that stores all the data. The table, named Fact, contains two columns: KEY and VALUE. The KEY column acts as a discriminator, while the VALUE column holds the measurements to be aggregated.

<roma:DatabaseSchema   id="_databaseSchema">
  <tables xsi:type="roma:PhysicalTable" id="_tab" name="Fact">
    <columns xsi:type="roma:PhysicalColumn" id="_col_id" name="ID" type="Integer"/>
    <columns xsi:type="roma:PhysicalColumn" id="_col_value" name="VALUE" type="Integer"/>
    <columns xsi:type="roma:PhysicalColumn" id="_col_name" name="NAME"/>
  </tables>
</roma:DatabaseSchema>

Note: This is only a symbolic example. For the exact definition, see the Definition section.

Query

This example uses a TableQuery, as it directly references the physical table Fact.

<roma:TableQuery  id="_query" table="_tab"/>

Note: This is only a symbolic example. For the exact definition, see the Definition section.

Cube, MeasureGroup and NTH Aggragator Measures

In this example, multiple measures are defined. All measures reference the VALUE column and use the following aggregation functions:

• NTH1 – NTH1 .
• NTH2 – NTH2 .
• NTH3 – NTH3 .
• NTH4 – NTH4 .
• NTH5 – NTH5 .
• NTH6 – NTH6 .
• NTH7 – NTH7 .

<roma:PhysicalCube   id="_cube" name="MeasuresAggregatorsCube" query="_query">
  <dimensionConnectors foreignKey="roma:PhysicalColumn _col_id" dimension="roma:StandardDimension _diml" overrideDimensionName="Dim" id="_dc_dim"/>
  <measureGroups>
    <measures xsi:type="roma:NthAggMeasure" id="_measure1" name="NthAgg1" column="_col_value" orderByColumns="/0" n="1"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure2" name="NthAgg2" column="_col_value" orderByColumns="/0" n="2"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure3" name="NthAgg3" column="_col_value" orderByColumns="/0" n="3"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure4" name="NthAgg4" column="_col_value" orderByColumns="/0" n="4"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure5" name="NthAgg5" column="_col_value" orderByColumns="/0" n="5"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure6" name="NthAgg6" column="_col_value" orderByColumns="/0" n="6"/>
    <measures xsi:type="roma:NthAggMeasure" id="_measure7" name="NthAgg7" column="_col_value" orderByColumns="/0" n="7"/>
  </measureGroups>
</roma:PhysicalCube>

Note: This is only a symbolic example. For the exact definition, see the Definition section.

Definition

This files represent the complete definition of the catalog.

<?xml version="1.0" encoding="UTF-8"?>
<xmi:XMI xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:roma="https://www.daanse.org/spec/org.eclipse.daanse.rolap.mapping">
  <roma:OrderedColumn column="_col_value"/>
  <roma:Catalog description="Nth value aggregation functions" name="Daanse Tutorial - Cube Measure Aggregator Nth" cubes="_cube" dbschemas="_databaseSchema"/>
  <roma:DatabaseSchema id="_databaseSchema">
    <tables xsi:type="roma:PhysicalTable" id="_tab" name="Fact">
      <columns xsi:type="roma:PhysicalColumn" id="_col_id" name="ID" type="Integer"/>
      <columns xsi:type="roma:PhysicalColumn" id="_col_value" name="VALUE" type="Integer"/>
      <columns xsi:type="roma:PhysicalColumn" id="_col_name" name="NAME"/>
    </tables>
  </roma:DatabaseSchema>
  <roma:TableQuery id="_query" table="_tab"/>
  <roma:Level id="_level" name="Value" column="_col_value"/>
  <roma:ExplicitHierarchy id="_hierarchy_Hierarchy" name="Hierarchy" hasAll="false" primaryKey="_col_id" query="_query" levels="_level"/>
  <roma:StandardDimension id="_diml" name="Diml" hierarchies="_hierarchy_Hierarchy"/>
  <roma:PhysicalCube id="_cube" name="MeasuresAggregatorsCube" query="_query">
    <dimensionConnectors foreignKey="_col_id" dimension="_diml" overrideDimensionName="Dim" id="_dc_dim"/>
    <measureGroups>
      <measures xsi:type="roma:NthAggMeasure" id="_measure1" name="NthAgg1" column="_col_value" orderByColumns="/0" n="1"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure2" name="NthAgg2" column="_col_value" orderByColumns="/0" n="2"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure3" name="NthAgg3" column="_col_value" orderByColumns="/0" n="3"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure4" name="NthAgg4" column="_col_value" orderByColumns="/0" n="4"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure5" name="NthAgg5" column="_col_value" orderByColumns="/0" n="5"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure6" name="NthAgg6" column="_col_value" orderByColumns="/0" n="6"/>
      <measures xsi:type="roma:NthAggMeasure" id="_measure7" name="NthAgg7" column="_col_value" orderByColumns="/0" n="7"/>
    </measureGroups>
  </roma:PhysicalCube>
</xmi:XMI>

Tutorial Zip

This files contaisn the data-tables as csv and the mapping as xmi file.

Download Zip File