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

So far your model has merged data from two files, then grouped and sorted the records. You now have a table that has the latest data about the TV Package that each Customer has.

You now want all the channels that the customer has ordered. You will look up the data about the channels provided by each package from a database table. To make sure that PhixFlow finds all the channels, you will use an output multiplier.

Load data from a database table

First, load the database table SOURCE_PACKAGE_CHANNELS into a table as described below. Your model will then have the list of channels available in each package:

1. In the repository, expand the list of Datasources.
2. Drag the datasource called Rating and Billing into your model.
   1. In the Properties (on the right), in the Datasource Instances section, double-click Default
   2. Update the fields URL, Username and Password with those provided in your training email.
   3. Save your changes.
3. In your model, hover your mouse pointer over Rating and Billing and click . PhixFlow displays a list of the tables available in this database. You can resize the list to make it easier to browse.
4. Right-click on SOURCE_PACKAGE_CHANNELS and select . PhixFlow adds a new  to the model, and gives it the same name as the source data table, SOURCE_PACKAGE_CHANNELS. In the Properties (on the right) → Basic Settings section → Statement Expression, you can see the database query is: 
     select * from SOURCE_PACKAGE_CHANNELS.
5. Hover your mouse pointer over the new SOURCE_PACKAGE_CHANNELS database collector, and click . PhixFlow adds a new table to your model and also gives it the name SOURCE_PACKAGE_CHANNELS. In the Properties → Attributes section, you can see that the data has two attributes (columns): Package and Channel.

6. To load the data into the table, run analysis on this section of the model and check the data has loaded.

   Hover your mouse pointer over the SOURCE_PACKAGE_CHANNELS table, click  then click YES to confirm. When PhixFlow notifies you that the analysis is finished, hover your mouse pointer over the table again. Click . In the drop-down list, select .  PhixFlow displays the data.

   Screenshot of your model and the data you have loaded:

   
   

7. 

Take a moment to look at this data. For each package, there are multiple channels included. For example, the News package includes Channel 1, Channel 2, Science 2 and NewsExtra.

Add another table 

Update your model to add a table. This table will take all the data that we have merged, sorted and grouped in the model so far:

1. Hover your mouse pointer over the Latest Package Update table and click .
2. In Basic Settings, set the Name to Latest Package All Channels.

3. Drag all the  from Latest Package Update to the property tab for Latest Package All Channels.

   Hover your mouse pointer over the table Latest Package Update. In the context toolbar, click . Phixflow lists the data attributes (column titles) for this table. Select all the attributes and drag them into the Latest Package All Channels  property tab → Attributes section.

   
   

4. Click  to save and close the Properties.
5. Close the attributes list.

Supplement the table with look-up data

You now need to add to the data in the Latest Package All Channels table. You will use a look-up pipe to add the channels provided by a package. PhixFlow needs to know how the data in the source table matches the data in the receiving table.

1. In the model, add a pipe from SOURCE_PACKAGE_CHANNELS to Latest Package All Channels. PhixFlow opens the Properties for the new pipe.
2. In the Basic Settings section, set:
   • Name: find_channels
   • Type: Look-up
3. Click  to register the change of pipe.
4. In the Order/Index section, click . PhixFlow opens two lists of attributes: one list for the source table and another for the receiving table. 
   1. From the source table list, on the left, drag PACKAGE into the Order/Index grid.
      
   2. This tells PhixFlow about the key column in the source table. Notice that PhixFlow has added a line to the Order/Index grid.
5. From the receiving table list, on the right, drag Package over the top of the line in the Order/Index grid.
   
   1. 
   
   This tells PhixFlow about the matching key column in the receiving table. Notice that PhixFlow has now added the Index Expression _out.Package. However, we do not want PhixFlow to use _out.Package because output multipliers are calculated before the output values is generated (see PhixFlow Timing Cycle). We need it to use the data where PACKAGE = Package is from the input pipe in.
We must do this, rather than using the value of Package from the output, because we are going to use the lookup to drive an output multiplier – and output multipliers are calculated before the output is generated.
   
6. In the Order/Index section, double-click the new line that PhixFlow has added. PhixFlow opens the property tab for the PACKAGE attribute. Set:
   • In the Basic Settings → Index Expression change from _out.Package to in.Package.
   • Click  to save and close the property tab.
7. Close the attribute list.
8. In the pipe property tab, click  to save and close.
9. In the model toolbar, click  to save your model, which should look like this:
   

At this point, if you run your model it will find each customer, e.g. C010, and will read that the customer has the News package.

Set an output multiplier

An output multiplier tells PhixFlow to process the same record multiple times, each time producing a new record. This is called breaking-out a record. In this case we want PhixFlow to keep processing the same customer record until it has found all the channels. This means our single input record:

becomes multiple output records, like this:

The output multiplier needs to know:

• which pipe it will use -  find_channels.
• what data you want to add - the channels.

The table also needs to create the new column for the channel information.

1. In the model, double-click Latest Package All Channels to open its Properties.
2. To create the output multiplier, expand the Analysis Options section and set:
   • Output Multiplier: find_channels.CHANNEL

3. To create a new column for the channel data, expand the Attributes section. Click  to add a new attribute. PhixFlow opens a new attribute property tab. Set:
   •  Name: Channel
   •  Expression: _outputMultiplier
4. Click  on both the New Table Attribute Properties and the Latest Package All Channels Properties.
5. Run the model and view the table data.

There should be 33 records, similar to the below image:

Notice that there are now multiple records for each customer. In the model toolbar, click  to save your model.