# Project over window

> Supported in: Batch, Faster, Streaming

Performs the specified aggregations on the data within the window. Emits one row each time a new row is received.

**Transform categories**: Aggregate

## Declared arguments

* **Dataset:** Dataset to perform aggregations on.<br>*Table*
* **Expressions:** List of expressions to evaluate over the window.<br>*List\<Expression\<AnyType>>*
* **Window:** Window to group data by.<br>*Window*