| --- |
| layout: doc_page |
| --- |
| # Time Boundary Queries |
| Time boundary queries return the earliest and latest data points of a data set. The grammar is: |
| |
| ```json |
| { |
| "queryType" : "timeBoundary", |
| "dataSource": "sample_datasource" |
| } |
| ``` |
| |
| There are 3 main parts to a time boundary query: |
| |
| |property|description|required?| |
| |--------|-----------|---------| |
| |queryType|This String should always be "timeBoundary"; this is the first thing Druid looks at to figure out how to interpret the query|yes| |
| |dataSource|A String defining the data source to query, very similar to a table in a relational database|yes| |
| |context|An additional JSON Object which can be used to specify certain flags.|no| |
| |
| The format of the result is: |
| |
| ```json |
| [ { |
| "timestamp" : "2013-05-09T18:24:00.000Z", |
| "result" : { |
| "minTime" : "2013-05-09T18:24:00.000Z", |
| "maxTime" : "2013-05-09T18:37:00.000Z" |
| } |
| } ] |
| ``` |
