# Data query
There are several types of data queries
- Raw data query
- Aggregate query
- Downsampling query
- Single point supplementary null query
- Latest data query
- Align by device query
- Group by fill query
In order to achieve the above kinds of queries, a basic query component for a single time series is designed in the IoTDB query engine, and on this basis, various query functions are implemented.
# Related documents
Copyright © 2021 The Apache Software Foundation.
Apache and the Apache feather logo are trademarks of The Apache Software Foundation
Contact us: Join QQ Group 659990460 | Add friend tietouqiao and be invited to Wechat Group
see Join the community for more