# Reshape

Pivot: Transpose unique values in a single column to generate multiple columns, aggregating as needed. The pivot will dynamically generate a column per unique value, or you can pass a list\_of\_vals with the unique values you wish to create columns for. Unpivot: Opposite of pivot, transforms a table by transforming columns into rows

## Parameters

| Name           | Type         | Description                                                                                                                                                                                                                                                                         | Is Optional |
| -------------- | ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------- |
| method         | string       | Method to reshape table 'pivot' to transpose unique values in a column to generate multiple columns or 'unpivot' to do the opposite.                                                                                                                                                |             |
| values         | column       | column to pivot and aggregate. Required for 'pivot' method.                                                                                                                                                                                                                         | True        |
| columns        | column       | Pivot: column with row values that will become columns. Required for 'pivot' method. Unpivot: List of columns in the source table that will be narrowed into a single pivot column. The column names will populate name\_column, and the column values will populate value\_column. | True        |
| agg\_method    | agg          | method of aggregation (i.e. sum, avg, min, max, etc.). Required for 'pivot' method.                                                                                                                                                                                                 | True        |
| value\_column  | string       | The name to assign to the generated column that will be populated with the values from the columns in the column list. Required for 'unpivot' method.                                                                                                                               | True        |
| name\_column   | string       | The name to assign to the generated column that will be populated with the names of the columns in the column list. Required for 'unpivot' method.                                                                                                                                  | True        |
| dimensions     | column\_list | Applicable to 'pivot' method only. Dimension columns after the pivot runs.                                                                                                                                                                                                          | True        |
| list\_of\_vals | string\_list | optional argument to override the dynamic lookup of all values in the value\_column and only pivot a provided list of values                                                                                                                                                        | True        |

## Example

Pull a source Dataset and preview it:

```python
ds = rasgo.get.dataset(id)
print(ds.preview())
```

|    | DATE       | SYMBOL |   CLOSE |
| -: | ---------- | ------ | ------: |
|  0 | 1990-09-26 | APA    |  4.8797 |
|  1 | 1990-08-06 | APA    |  4.3312 |
|  2 | 1990-06-12 | APA    |  3.8123 |
|  3 | 2007-10-19 | XRX    | 36.0728 |
|  4 | 2007-08-20 | XRX    | 34.4498 |
|  5 | 2007-07-10 | XRX    | 42.5646 |
|  6 | 2007-03-07 | XRX    | 36.3541 |
|  7 | 2007-03-01 | XRX    | 37.1547 |
|  8 | 2007-01-04 | XRX    | 36.5489 |
|  9 | 2006-07-13 | XRX    | 29.7325 |

Transform the Dataset and preview the result:

```python
ds2 = ds.reshape(
  dimensions=['DATE'],
  values='CLOSE',
  columns='SYMBOL',
  agg_method='AVG',
  list_of_vals=['JP','GOOG','DIS','APLE'],
  method='pivot'
)
ds2.preview()

ds3 = ds2.reshape(
  value_column="CLOSE",
  name_column="SYMBOL",
  columns=['JP','GOOG','DIS','APLE'],
  method='unpivot'
)
ds3.preview()

```

|    | DATE       |      JP |    GOOG |     DIS |    APLE |
| -: | ---------- | ------: | ------: | ------: | ------: |
|  0 | 2013-07-26 |         | 441.022 | 59.0729 |         |
|  1 | 2017-11-21 | 19.7923 | 1034.49 | 99.3686 |   16.48 |
|  2 | 2006-11-17 |         | 248.464 | 27.0257 |         |
|  3 | 2005-09-12 |         | 154.292 |   20.39 |         |
|  4 | 1999-07-01 |         |         | 22.1751 |         |
|  5 | 1998-02-03 |         |         | 27.3093 |         |
|  6 | 1996-04-22 |         |         | 15.2845 |         |
|  7 | 2017-07-25 |   7.221 |   950.7 | 102.668 | 15.0863 |
|  8 | 2006-12-08 |         | 241.151 | 28.2154 |         |
|  9 | 2016-12-12 |  8.1188 |  789.27 |   99.65 |  15.739 |

## Source Code

{% embed url="<https://github.com/rasgointelligence/RasgoTransforms/blob/main/rasgotransforms/rasgotransforms/transforms/reshape/snowflake/reshape.sql>" %}


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