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# HKQueryDescriptor

A descriptor that specifies a set of samples based on the data type and a predicate.

```
class HKQueryDescriptor
```

## Overview

Use descriptors to create queries that return multiple data types. You can use descriptors when creating [`HKSampleQuery`](/documentation/HealthKit/HKSampleQuery), [`HKAnchoredObjectQuery`](/documentation/HealthKit/HKAnchoredObjectQuery), or [`HKObserverQuery`](/documentation/HealthKit/HKObserverQuery) instances.

## Topics

### Creating Query Descriptors

[`init(sampleType:predicate:)`](/documentation/HealthKit/HKQueryDescriptor/init(sampleType:predicate:))

Creates a new descriptor for the data type and predicate you provided.

### Accessing Descriptor Data

[`predicate`](/documentation/HealthKit/HKQueryDescriptor/predicate)

The predicate that filters samples matching this descriptor.

[`sampleType`](/documentation/HealthKit/HKQueryDescriptor/sampleType)

The data type of samples that match this descriptor.


---

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