---
title: "system.opchda.getAggregates"
description: "Will query the server for aggregates that it supports."
---

# system.opchda.getAggregates

> Will query the server for aggregates that it supports.

This function is used in **Python Scripting**.

## Description
## Client Permission Restrictions
This scripting function has no [Client Permission](../../../ignition-modules/vision/vision-project-properties/vision-project-properties.md#vision-permissions-properties) restrictions.

## Syntax
`system.opchda.getAggregates(serverName)`

### Parameters
Type | Parameter | Description 
------- | ------- | ------
String | `serverName` | The name of the defined [OPC-HDA](../../../ignition-modules/opc-ua/third-party-opc-servers/opc-com/opc-com.md) server to query.

### Returns
**List[Aggregate]** - A list of supported [Aggregate](https://sdk.inductiveautomation.com/javadoc/ignition81/latest/com/inductiveautomation/ignition/common/sqltags/history/Aggregate.html) objects. Each object has 'id', 'name', and 'desc' properties defined.
### Scope
Gateway, Vision Client, Perspective Session