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

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  • Create Lookup Pipeslookup pipes
  • Enrich a data set using a Lookup Pipe

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  • lookup pipe

Copy data from merge

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

  • Hover over the stream Customer All Details, and press Image Removed press Image Added - Add a new Stream
  • Call this Streamstream: Customer Details with Region
  • Copy all attributes into your new Streamstream:
    • Hover over Customer All Details and in the hover menu press Image Removed press Image Added - 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 stream and look at the data in it to verify that you have copied data from the merge Streamstream
  • Remember to save your model layout

    Here you have copied data from a merge Stream into a new

    Stream

    stream – but this method works for any type of input

    Stream

    stream. Copying data into a new

    Stream

    stream is a common starting point for a modelling step.

    Anchor_Toc442889059_Toc442889059

    Create a lookup into reference data


Now you will add a

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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 Image Removed Image Added- 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 Streamstream
  • In the Pipe Setup pipe details form that pops up:
    • Enter the Name: region
    • Type: Look-up
    • Data To Read: leave as the default – Latest
    • Press Press Image Modified - Apply
    • In the matching attributes form that pops up create a match:Order/Index section we will set up the fields to match across the two data sets:
      • Press Image Added - Show Source and Target Attributes
      • Drag the attribute County from the left hand box list (the input attributes from the stream RegionsByCounty) into the list of matching Order/Index attributes
      • Drag the attribute in_ County from the right hand box into the list of matching attributes – on top of the entry for County you created abovelist (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 = in_ County in the output data (Customer Details with Region)
      • Press 
    • A Note that the pipe will appear linking RegionsByCounty to Customer Details with Region - note that the pipe is dashed; this indicates that this is a lookup pipe
    • When adding Lookup Pipes 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

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