2021-01-14 03:52:35 -05:00
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## TimeBoundary查询
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> [!WARNING]
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> Apache Druid支持两种查询语言： [Druid SQL](druidsql.md) 和 [原生查询](makeNativeQueries.md)。该文档描述了仅仅在原生查询中的一种查询方式。
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时间边界查询返回数据集的最早和最新数据点。语法是：
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```json
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{
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"queryType" : "timeBoundary",
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"dataSource": "sample_datasource",
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"bound" : < "maxTime" | "minTime" > # optional, defaults to returning both timestamps if not set
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"filter" : { "type": "and", "fields": [<filter>, <filter>, ...] } # optional
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}
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```
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时间边界查询有3个主要部分：
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| 属性 | 描述 | 是否必须 |
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|-|-|-|
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| `queryType` | 该字符串始终为"search", Druid根据该字段来确定如何执行该查询 | 是 |
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| `dataSource` | 要查询的数据源， 类似于关系型数据库的表。 可以通过 [数据源](datasource.md) 来查看更多信息| 是 |
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| `bound` | 可选，设置为 `maxTime` 或 `minTime` 仅返回最新或最早的时间戳。如果未设置，则默认为返回两者 | 否 |
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| `filter` | 参考 [Filters](filters.md) | 否 |
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| `context` | 参见 [查询上下文](query-context.md) | 否 |
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结果的格式为：
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```json
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[ {
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"timestamp" : "2013-05-09T18:24:00.000Z",
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"result" : {
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"minTime" : "2013-05-09T18:24:00.000Z",
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"maxTime" : "2013-05-09T18:37:00.000Z"
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}
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} ]
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```
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