$inc
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Definition
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$inc
-
The
$inc
operator increments a field by a specified value and has the following form:To specify a
<field>
in an embedded document or in an array, use dot notation.
Behavior
The $inc
operator accepts positive and negative values.
If the field does not exist, $inc
creates the field and sets the field to the specified value.
Use of the $inc
operator on a field with a null value will generate an error.
$inc
is an atomic operation within a single document.