<commit_before># PostgreSQL examples

## Example notebooks

|Notebook|Short description|
|[**PostgreSQL histograms**](PostgreSQL_histograms.ipynb)|Example notebook of how to generate frequency histograms using PostgreSQL|
<commit_msg>Add example notebook on how to generate histograms with PostgreSQL<commit_after># PostgreSQL examples

## Example notebooks

|Notebook|Short description| 
| -------------------------- | -------------------------|
|[**PostgreSQL histograms**](PostgreSQL_histograms.ipynb)|Example notebook of how to generate frequency histograms using PostgreSQL|

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