# GroupByCallback

# Type Alias: GroupByCallback()\<TContext\>

```ts
type GroupByCallback<TContext> = (refs) => any;
```

Defined in: [packages/db/src/query/builder/types.ts:446](https://github.com/TanStack/db/blob/main/packages/db/src/query/builder/types.ts#L446)

GroupByCallback - Type for groupBy clause callback functions

These callbacks receive refs for all available tables and should return
expressions that will be used for grouping query results.

Example: `(refs) => refs.orders.status`

## Type Parameters

### TContext

`TContext` *extends* [`Context`](../interfaces/Context.md)

## Parameters

### refs

[`RefsForContext`](RefsForContext.md)\<`TContext`\>

## Returns

`any`