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 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 Setup form that pops up:
  • Enter the Name: region
  • Type: Look-up
  • Data To Read: leave as the default – Latest
  • Press
  • In the matching attributes form that pops up create a match:
    • Drag the attribute County from the left hand box into the list of matching 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 above

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 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 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