readme.md

Statistical query

Query a table to get aggregated statistics back for a specific field.

Use case

For example, a county boundaries table with population information can be queried to return aggregated results for total, average, maximum, and minimum population, rather than downloading the values for every county and calculating statistics manually.

How to use the sample

Pan and zoom to define the extent for the query. Click 'Get statistics' and choose one of the options.

How it works

1. Create a ServiceFeatureTable with a URL to the feature service.
2. Create StatisticsQueryParameters, and StatisticDefinition objects, and add to the parameters.
3. Execute QueryStatistics on the ServiceFeatureTable. Depending on the state of the two checkboxes, additional parameters are set.
4. Display each StatisticRecord in the first returned QueryStatisticsResult.

Relevant API

• QueryParameters
• ServiceFeatureTable
• StatisticDefinition
• StatisticRecord
• StatisticType
• StatisticsQueryParameters
• StatisticsQueryResult

Tags

analysis, average, bounding geometry, filter, intersect, maximum, mean, minimum, query, spatial query, standard deviation, statistics, sum, variance