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# Method name: run(options: RunOptions)

# Method package: wixData

# Method menu location: wixData --> WixDataAggregate --> run

# Method Link: https://dev.wix.com/docs/velo/apis/wix-data/wix-data-aggregate/run.md

# Method Description:

Runs the aggregation and returns the results.

The `run()` function returns a Promise that resolves to the results found
 by the aggregation and some information about the results.
 > **Note:** Aggregations can only be used on collections you have created. They cannot be
 used on [Wix App Collections](https://support.wix.com/en/article/cms-formerly-content-manager-working-with-wix-app-collections).



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## Perform an aggregation

```javascript
aggregate.run()
  .then((results) => {
    if (results.items.length > 0) {
      let items = results.items;
      let numItems = results.length;
      let hasNext = results.hasNext();  
    } else {
      // handle case where no matching items found
    }
  })
  .catch((error) => {
    let errorMsg = error.message;
    let code = error.code;
  });
```

## Create an aggregation with filtering and grouping and run it

```javascript
import wixData from 'wix-data';

// ...

const filter = wixData.filter().eq("year", 2010);
const having = wixData.filter().gt("maxPopulation", 1000000);

wixData.aggregate("PopulationData")
  .filter(filter)
  .group("state")
  .max("population", "maxPopulation")
  .having(having)
  .descending("maxPopulation")
  .skip(5)
  .limit(3)
  .run()
  .then((results) => {
    if (results.items.length > 0) {
      let items = results.items;
      let numItems = results.length;
      let hasNext = results.hasNext();
    } else {
      // handle case where no matching items found
    }
  })
  .catch((error) => {
    let errorMsg = error.message;
    let code = error.code;
  });
```

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