Einstein Analytics: Connect Data Sources and Binding between Dataset

Einstein Analytics allow us to have more than 1 dataset in a dashboard. With Connect Data Source, we can link the dataset using a common field from both datasets, but the field must be used in the dashboard.

Let us using following sample of datasets:

Connect the data source using "Region"

With Connected Data Source, when we select a Region in Target, the Actual Region picklist will be filtered too, if Apply filters from faceting is enabled, this is enabled by default.

The same when we select Actual Region with a value, Target Region will be filtered too -- if "Apply filters from faceting" is enabled.

Without adding Region (actual) dropdown list, Actual value will be still filtered correctly. That's all about Connect Data Source, but in some cases, we can't connect data source, binding is powerful for this, but you need to get your hand dirty with JSON.

Let's see the result first:

Selecting a Region in Target do not filter picklist value in Actual, but the Actual value is changed accordingly, the same as in Connect Data Source.

In this sample, we need to add a filter into the step of Actual value.
This is the original query:
 "query": {
            "measures": [
                    [
                       "sum",
                       "Sales_Actual"
                    ]
            ],
            "groups": [
                       "Sales_Region"
            ]
          }

Add filters to the query:
"query": {
            "measures": [
                    [
                      "sum",
                      "Sales_Actual"
                    ]
            ],
            "groups": [
                       "Sales_Region"
            ],
            "filters": [
                    [
                       "Sales_Region",
                       "{{column(list_Target.selection,[\"Region\"]).asObject()}}",
                       "in"
                    ]
             ]
          }

• Sales_Region is API field name for the column Region from Actual dataset -- we will need to use that field as filtering
• list_Target is the step name for Target Region drop-down.
• Region is the API field name for the column Region from Target dataset.

Reference:

• Configure Cross-Dataset Faceting with Connected Data Sources