Query Fundamentals

This chapter introduces some basic concepts, terms and things to pay attention in IoTDB Query design. Designers and developers who hope to start with IoTDB query design may find this guide helpful, as some concepts will be treated as common sense and not explained in detail in the following chapters.

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When querying a TVList, the TimeRanges are sorted and merged before a TVList tries to access them. For example, we have [1,10], [5,12], [15,20], [16,21] in the original list, then they will be preprocessed to [1,12] and [15,21].For cases when where there are a large number of deletion operations, it would be helpful to exclude deleted data.

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