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

  • Create lookup pipes
  • Enrich a data set using a lookup pipe

Copy data from merge

First, you will create a new stream to copy over all data from your merge:

  • Hover over the stream Customer All Details, and press  - Add a new Stream
  • Call this stream: Customer Details with Region
  • Copy all attributes into your new stream:
    • Hover over Customer All Details and in the hover menu press  - Show Stream Attributes
    • Select all attributes in the list:
      • Select the top attribute
      • Keep shift pressed down and select the bottom attribute in the list
    • Drag the attributes on top of the stream Customer Details with Region
  • Run your new stream and look at the data in it to verify that you have copied data from the merge stream
  • Remember to save your model layout

    Here you have copied data from a merge Stream into a new stream – but this method works for any type of input stream. Copying data into a new stream is a common starting point for a modelling step.

    Create a lookup into reference data


Now you will add a lookup pipe from Regions by County to enrich the data in Customer Details with Region, by finding the region for each customer address:

  • Hover over RegionsByCounty and press - Add a new Connector
  • Move the pointer over the top of Customer Details with Region and select – this will attach the end of the pipe to the selected stream
  • In the pipe details form that pops up:
    • Enter the Name: region
    • Type: Look-up
    • Data To Read: leave as the default – Latest
    • In the Order/Index section we will set up the fields to match across the two data sets:
      • Press  - Show Source and Target Attributes
      • Drag the attribute County from the left hand list (the input attributes from the stream RegionsByCounty) into the list of Order/Index attributes
      • Drag the attribute County from the right hand list (the output attributes from the stream Customer Details with Region) on top of the Order/Index attribute County
        • You should see the Index Expression of the Order/Index attribute update to _out.County
        • This means that the lookup will match records in the reference data (RegionsByCounty) where County = County in the output data (Customer Details with Region)
      • Press 
    • Note that the pipe linking RegionsByCounty to Customer Details with Region is dashed; this indicates that this is a lookup pipe
    • When adding lookup pipes remember that the arrow points in the direction that the data flows; here you are getting data from RegionsByCounty to add to Customer Details with Region

Enrich a data set using a Lookup Pipe

Now you can add the region – from RegionsByCounty – to Customer Details with Region:

  • Hover over RegionsByCounty and in the hover menu press  - Show Stream Attributes
  • The list of the stream attributes will pop up
  • Drag the attribute Region from RegionsByCounty on top of Customer Details with Region
  • Run analysis on Customer Details with Region
  • Have a look at the data in this stream – check that the Region attribute has been populated with the value looked up from RegionsByCounty
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