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divide.txt
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divide.txt
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=====================
$divide (aggregation)
=====================
.. default-domain:: mongodb
.. contents:: On this page
:local:
:backlinks: none
:depth: 1
:class: singlecol
Definition
----------
.. expression:: $divide
Divides one number by another and returns the result. Pass the
arguments to :expression:`$divide` in an array.
The :expression:`$divide` expression has the following syntax:
.. code-block:: javascript
{ $divide: [ <expression1>, <expression2> ] }
The first argument is the dividend, and the second argument is the
divisor; i.e. the first argument is divided by the second argument.
The arguments can be any valid :ref:`expression
<aggregation-expressions>` as long as the resolve to numbers. For
more information on expressions, see :ref:`aggregation-expressions`.
Examples
--------
Consider a ``planning`` collection with the following documents:
.. code-block:: javascript
{ "_id" : 1, "name" : "A", "hours" : 80, "resources" : 7 },
{ "_id" : 2, "name" : "B", "hours" : 40, "resources" : 4 }
The following aggregation uses the :expression:`$divide` expression to
divide the ``hours`` field by a literal ``8`` to compute the number of
work days:
.. code-block:: javascript
db.planning.aggregate(
[
{ $project: { name: 1, workdays: { $divide: [ "$hours", 8 ] } } }
]
)
The operation returns the following results:
.. code-block:: javascript
{ "_id" : 1, "name" : "A", "workdays" : 10 }
{ "_id" : 2, "name" : "B", "workdays" : 5 }