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Aug 29, 2019
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Example for adding a calculated column in SQL and Pandas #28182

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60f3bf4
Add example for adding a calculated column
DavidRosen Aug 27, 2019
157d8de
Update doc/source/getting_started/comparison/comparison_with_sql.rst
DavidRosen Aug 27, 2019
427a46b
try fix lint error: space around = in keyword
DavidRosen Aug 27, 2019
f0d90f0
add space around / operator per lint error
DavidRosen Aug 28, 2019
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14 changes: 14 additions & 0 deletions doc/source/getting_started/comparison/comparison_with_sql.rst
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Expand Up @@ -49,6 +49,20 @@ With pandas, column selection is done by passing a list of column names to your
Calling the DataFrame without the list of column names would display all columns (akin to SQL's
``*``).

In SQL, you can add a calculated column:

.. code-block:: sql

SELECT *, tip/total_bill as tip_rate
FROM tips
LIMIT 5;

With pandas, you can use the :meth:`DataFrame.assign` method of a DataFrame to append a new column:

.. ipython:: python

tips.assign(tip_rate=tips['tip'] / tips['total_bill']).head(5)

WHERE
-----
Filtering in SQL is done via a WHERE clause.
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