Visualizing query results - Amazon Redshift

Visualizing query results

After you run a query and the results display, you can turn on Chart to display a graphic visualization of the results. You can use the following controls to define the content, structure, and appearance of your chart:


                    Trace Trace

Represents a set of related graphical marks in a chart. You can define multiple traces in a chart.

Type

You can define the trace type to represent data as one of the following:

  • Scatter chart for a scatter plot or bubble chart.

  • Bar chart to represent categories of data with vertical or horizontal bars.

  • Area chart to define filled areas.

  • Histogram that uses bars to represent frequency distribution.

  • Pie chart for a circular representation of data where each slice represents a percentage of the whole.

  • Funnel or Funnel Area chart to represent data through various stages of a process.

  • OHLC (open-high-low-close) chart often used for financial data to represent open, high, low, and close values along the x-axis, which usually represents intervals of time.

  • Candlestick chart to represent a range of values for a category over a timeline.

  • Waterfall chart to represent how an initial value increases or decreases through a series of intermediate values. Values can represent time intervals or categories.

  • Line chart to represent changes in value over time.

X axis

You specify a table column that contains values to plot along the X axis. Columns that contain descriptive values usually represent dimensional data. Columns that contain quantitative values usually represent factual data.

Y axis

You specify a table column that contains values to plot along the Y axis. Columns that contain descriptive values usually represent dimensional data. Columns that contain quantitative values usually represent factual data.

Subplots

You can define additional presentations of chart data.

Transforms

You can define transforms to filter trace data. You use a split transform to display multiple traces from a single source trace. You use an aggregate transform to present a trace as an average or minimum. You use a sort transform to sort a trace.

General appearance

You can set defaults for background color, margin color, color scales to design palettes, text style and sizes, title style and size, and mode bar. You can define interactions for drag, click, and hover. You can define meta text. You can define default appearances for traces, axes, legends, and annotations.

Choose Traces to display the results as a chart. For Type, choose the style of chart as Bar, Line, and so on. For Orientation, you can choose Vertical or Horizontal. For X, choose the table column that you want to use for the horizontal axis. For Y, choose the table column that you want to use for the vertical axis.

Choose Refresh to update the chart display. Choose Full screen to expand the chart display.

To create a chart

  1. Run a query and get results.

  2. Turn on Charts.

  3. Choose Trace and start to visualize your data.

  4. Choose a chart style from one of the following:

    • Scatter

    • Bar

    • Area

    • Histogram

    • Pie

    • Funnel

    • Funnel Area

    • OHLC (open-high-low-close)

    • Candlestick

    • Waterfall

    • Line

  5. Choose Style to customize the appearance, including colors, axes, legend, and annotations. You can add text, shapes, and images.

  6. Choose Annotations to add text, shapes, and images.

To save a chart

  1. Choose Save Chart.

  2. Enter a name for your chart.

  3. Choose Save.

To export a chart

  1. Choose Export.

  2. Choose PNG or JPEG.

  3. Set the width and height for your chart.

  4. Choose Export.

  5. Choose to open the file in your default graphic application or save the file with the default name.

To browse for and open a saved chart

  1. Choose the Charts tab.

  2. Open the chart that you want.

To organize your charts into folders

  1. Choose Charts from the navigation pane.

  2. Choose New folder and name the folder.

  3. Choose Create to create the folder in the Charts tab.

    You can move charts in and out of the folder using drag-and-drop.

Example: Create a pie chart to visualize query results

The following example uses the Sales table of the sample database. For more information, see Sample database in the Amazon Redshift Database Developer Guide.

Following is the query that you run to provide the data for the pie chart.

select top 5 eventname, count(salesid) totalorders, sum(pricepaid) totalsales from sales, event where sales.eventid=event.eventid group by eventname order by 3;

To create a pie chart for the top event by total sales

  1. Run the query.

  2. In the query results area, turn on Chart.

  3. Choose Trace.

  4. For Type, choose Pie.

  5. For Values, choose totalsales.

  6. For Labels, choose eventname.

  7. Choose Style and then General.

  8. Under Colorscales, choose Categorical and then Pastel2.

Pie chart

Example: Create a combination chart for comparing revenue and sales

Perform the steps in this example to create a chart that combines a bar chart for revenue data and a line graph for sales data. The following example uses the Sales table of the tickit sample database. For more information, see Sample database in the Amazon Redshift Database Developer Guide.

Following is the query that you run to provide the data for the chart.

select eventname, total_price, total_qty_sold from (select eventid, total_price, total_qty_sold, ntile(1000) over(order by total_price desc) as percentile from (select eventid, sum(pricepaid) total_price, sum(qtysold) total_qty_sold from tickit.sales group by eventid)) Q, tickit.event E where Q.eventid = E.eventid and percentile = 1 order by total_price desc;

To create a combination chart for comparing revenue and sales

  1. Run the query.

  2. In the query results area, turn on Chart.

  3. Under trace o, for Type, choose Bar.

  4. For X, choose eventname.

  5. For Y, choose total_price.

    The bar chart displays with event names along the X axis.

  6. Under Style, choose Traces.

  7. For Name, enter Revenue.

  8. Under Style, choose Axes.

  9. For Titles, choose Y and enter Revenue.

    The label Revenue displays on the left Y axis.

  10. Under Structure, choose Traces.

  11. Choose 
                    Trace Trace.

    The trace 1 options display.

  12. For Type, choose Line.

  13. For X, choose eventname.

  14. For Y, choose total_qty_sold.

  15. Under Axes To Use, for Y Axis choose 
                    Trace.

    The Y Axis displays Y2.

  16. Under Style, choose Axes.

  17. Under Titles, choose Y2.

  18. For Name, enter Sales.

  19. Under Lines, choose Y:Sales.

  20. Under Axis Line, choose Show and for Position, choose Right.

Revenue and sales chart