> **Experimental**
>
> `@aws-cdk/aws-redshift-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# ColumnEncoding

The compression encoding of a column.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/table.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-redshift-alpha/lib/table.ts#L413)

## Example

```ts
import { ColumnEncoding } from '@aws-cdk/aws-redshift-alpha';

new Table(this, 'Table', {
  tableColumns: [
    { name: 'col1', dataType: 'varchar(4)', encoding: ColumnEncoding.TEXT32K },
    { name: 'col2', dataType: 'float', encoding: ColumnEncoding.DELTA32K },
  ],
  cluster: cluster,
  databaseName: 'databaseName',
});
```

## Members

| Member | Description |
| --- | --- |
| `AUTO` | Amazon Redshift assigns an optimal encoding based on the column data. |
| `RAW` | The column is not compressed. |
| `AZ64` | The column is compressed using the AZ64 algorithm. |
| `BYTEDICT` | The column is compressed using a separate dictionary for each block column value on disk. |
| `DELTA` | The column is compressed based on the difference between values in the column. |
| `DELTA32K` | The column is compressed based on the difference between values in the column. |
| `LZO` | The column is compressed using the LZO algorithm. |
| `MOSTLY8` | The column is compressed to a smaller storage size than the original data type. |
| `MOSTLY16` | The column is compressed to a smaller storage size than the original data type. |
| `MOSTLY32` | The column is compressed to a smaller storage size than the original data type. |
| `RUNLENGTH` | The column is compressed by recording the number of occurrences of each value in the column. |
| `TEXT255` | The column is compressed by recording the first 245 unique words and then using a 1-byte index to represent each word. |
| `TEXT32K` | The column is compressed by recording the first 32K unique words and then using a 2-byte index to represent each word. |
| `ZSTD` | The column is compressed using the ZSTD algorithm. |

## Referenced by

- [`Column`](/v2/docs/@aws-cdk_aws-redshift-alpha.Column).encoding