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Aggregate Data on a Date or Date and Time Field

Tip:  Interface patterns give you an opportunity to explore different interface designs. Be sure to check out How to Adapt a Pattern for Your Application.

Goal

Aggregate data, specifically the total number of employees by date.

Note:  This expression uses direct references to the Employee record type, created in the Records Tutorial. If you've completed that tutorial in your environment, you can change the existing record-type references in this pattern to point to your Employee record type instead.

images/bar-chart-aggregate-data-on-date-field.png

Create this pattern

You can easily configure a chart in design mode when you use a record type as the source.

To create this pattern in design mode:

  1. Open a new or empty interface object.
  2. From the PALETTE, drag a Bar Chart component into the interface.
  3. From Data Source, select RECORD TYPE and search for the Employee record type.
  4. Under Primary Grouping, select the startDate field.
  5. Click the edit icon next to the selected field and set Time Interval to Month of Year.
  6. Under Format Value, use the dropdown to choose a pre-defined format. Select the short text date.
  7. Click Bar Chart to return to the bar chart configuration.
  8. Click ADD GROUPING.
  9. Under Secondary Grouping, select the department field.
  10. Under Measure, use the dropdown to select Count of, then select the id field.
  11. From Stacking, select Normal.
  12. From Color Scheme, select Ocean.

Your resulting expression will look something like this:

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a!barChartField(
    data: recordType!Employee,
    config: a!barChartConfig(
      primaryGrouping: a!grouping(
        field: recordType!Employee.fields.startDate,
        alias: "startDate_month_of_year_primaryGrouping",
        interval: "MONTH_OF_YEAR_SHORT_TEXT"
      ),
      secondaryGrouping: a!grouping(
        field: recordType!Employee.fields.department,
        alias: "department_secondaryGrouping"
      ),
      measures: {
        a!measure(
          function: "COUNT",
          field: recordType!Employee.fields.id,
          alias: "id_count_measure1"
        )
      },
      dataLimit: 100
    ),
    label: "Bar Chart",
    labelPosition: "ABOVE",
    stacking: "NORMAL",
    showLegend: true,
    showTooltips: true,
    colorScheme: "OCEAN",
    height: "MEDIUM",
    xAxisStyle: "STANDARD",
    yAxisStyle: "STANDARD"
  )

Test it out

  1. Hover over each of the stacked month data to see a breakdown of the number of employees in each department.

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