Page Comparison

By the end of this chapter you will be able to:

You will also learn how to pass only some records to the receiving stream using the Maximum Number of Records per Group option.

In this exercise you will select the most recent sales record for each customer from the set of combined updates you created in the previous exercise.

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In PhixFlow, we use an aggregate stream to show that we are rearranging data from a single stream. See the reference page Aggregate Stream for details.

1. In From the model toolbar, find drag 

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   _streamtable_aggregate _streamtable_aggregate nopanel true

     and drag it into  into the model.
2. Set the stream Name to Latest Package Update.
3. Add a pipe from Combined Updates:
   1. Hover your mouse pointer over the stream Combined Updates.
   2. In the context toolbar, click 

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      _pipe _pipe nopanel true

      .
   3. Click the stream Latest Package Update to connect the pipe.
   4. PhixFlow opens the pipe settings. Click 

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      _finish _finish nopanel true

       to close the settings.
4. Drag all attributes from Combined Updates to Latest Package Update.
   1. Make sure the open settings form is for the stream Latest Package Update.
   2. Hover your mouse pointer over the stream Combined Updates.
   3. In the context toolbar, click 

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      _stream_attributes _stream_attributes nopanel true

      . Phixflow lists the data attributes (column titles) for this stream.
   4. Select all the attributes and drag them into the Latest Package Update settings → Attributes section.
      
   5. Click 

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      _finish _finish nopanel true

       to save and close the Latest Package Updates settings.
   6. Close the attributes pop-up window.
5. In the Channel Package model toolbar, click 

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   _save _save nopanel true

   .

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1. In the model, double-click on the pipe from the  Combined Updates stream.
2. Expand the Sort/Group section toolbar.
3. In the section toolbar, click

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   _stream_attributes_stream _attributes nopanel true

   . Phixflow opens a list of the attributes that the Combined Updates stream can pass to the pipe.
   
4. Drag in CustomerRef. By default, this attribute has Group ticked and Direction set to A-Z (ascending).
   This means the data records will be grouped by CustomerRef.
5. Drag in SalesDate. Double-click on SalesDate in the Sort/Group grid. PhixFlow opens the settings for the attribute. In Basic Settings, set:
   • Direction: Z-A (descending)
     
   • Group: 

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     _check_box_untick _check_box_untick nopanel true

   • Click 

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     _finish _finish nopanel true

      to save the change and close the attribute settings.
     This means the data records will be sorted by date, with the most recent first. 
6. In the pipe settings → Sort/Group section, set Maximum Number of Records per Group to 1.
   This means PhixFlow will pass only one record, the first and therefore most recent, to the receiving stream.
   
   
7. Click 

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   _save _save nopanel true

    to save the pipe settings, which should look like this:
   
8. In the model toolbar, click 

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   _save _save nopanel true

    to save the model.

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1. Hover your mouse pointer over the Latest Package Update stream and click 

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   _run_analysis _run_analysis nopanel true

    then click YES to confirm.
2. When PhixFlow notifies you that the analysis is finished, hover your mouse pointer over the Latest Package Update stream again.
3. Click 

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   _view_show _streamview_views_show_stream_views nopanel true

   .
4. In the drop-down list, select 

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   _view_default _view_default_view nopanel true

   .  PhixFlow displays the data.
   
   Notice that there is only one record per customer reference.
5. If you also look at the default view for the Combined Updates stream, you will see that some customers, such as C056 have more than one record. The most recent record has been passed to the Latest package Update stream.

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