# Histogram

Returns the count of data points that fall within each bin as a vector. The bins are left-inclusive and right-exclusive, i.e. `[a, b)`, except for the last one which is inclusive on both sides `[a, b]`.

## Signatures

1. Equal length bins (better performance):

> HISTOGRAM(colName, lower, upper, numBins)

1. Arbitrary increasing bin edges:

> HISTOGRAM(colName, ARRAY\[binEdge1, binEdge2, binEdge3, ...])

## Usage Examples

These examples are based on the [Batch Quick Start](https://docs.pinot.apache.org/release-1.1.0/basics/getting-started/quick-start#batch).

1. 10 equal-length bins `[0, 20), [20, 30) ... [180, 200]`

```sql
SELECT HISTOGRAM(numberOfGames, 0, 200, 10) AS histogram
FROM baseballStats 
```

| histogram                                        |
| ------------------------------------------------ |
| 32348,21519,11359,7587,5488,5360,6282,7361,585,0 |

1. 6 bins `(- ∞, 1), [1, 10), [10, 50), [50,100), [100,500), [500, 1000]`

```sql
select HISTOGRAM(AtBatting, Array['-Infinity', 1, 10, 50, 100, 500, 1000]) AS histogram
from baseballStats
```

| histogram                          |
| ---------------------------------- |
| 13520,16506,18375,12403,28591,8494 |


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