Basic database question

Hi All,

Sorry for asking so basic question, as I am very new to this database.

In other databases like MySQL we create tables how it is done in druid. How the aggregation is done, do we need to define the aggregation or

it is done automatically at the time of querying.

Thanks in advance.

Hi Amit,

In Druid there is not really a concept of “creating a table” (and actually we call them “datasources” because we like to be different). They get created automatically whenever you ingest data. Aggregation can optionally be done at ingest time (through the “rollup” concept) and, either way, people generally do aggregation at query time too.