# Siddhi Queries

These queries support simple, aggregation and command query types.

Siddhi specific features for special use cases are as follows:

## Query Parameters

<table><thead><tr><th width="267.88983220943845">Parameter</th><th width="200">Definition</th></tr></thead><tbody><tr><td>unidirectional</td><td>Adds "unidirectional" to from and join statements</td></tr><tr><td>window</td><td>Sets "window" for from and join statements</td></tr></tbody></table>

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Siddhi Guide
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