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MongoDB operators

chifarol answered on October 4, 2022 Popularity 10/10 Helpfulness 2/10

answer MongoDB operators

MongoDB operators

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#UPDATE OPERATORS
1. single fields
$currentDate
Sets the value of a field to current date, either as a Date or a Timestamp.
$inc
Increments the value of the field by the specified amount.
$min
Only updates the field if the specified value is less than the existing field value.
$max
Only updates the field if the specified value is greater than the existing field value.
$mul
Multiplies the value of the field by the specified amount.
$rename
Renames a field.
$set
Sets the value of a field in a document.
$setOnInsert
Sets the value of a field if an update results in an insert of a document. Has no effect on update operations that modify existing documents.
$unset
Removes the specified field from a document.


2. update array fields
$
Acts as a placeholder to update the first element that matches the query condition.
$[]
Acts as a placeholder to update all elements in an array for the documents that match the query condition.
$[<identifier>]
Acts as a placeholder to update all elements that match the arrayFilters condition for the documents that match the query condition.
$addToSet
Adds elements to an array only if they do not already exist in the set.
$pop
Removes the first or last item of an array.
$pull
Removes all array elements that match a specified query.
$push
Adds an item to an array.
$pullAll
Removes all matching values from an array.

3. modifiers
  $each
Modifies the 
$push
 and 
$addToSet
 operators to append multiple items for array updates.
$position
Modifies the 
$push
 operator to specify the position in the array to add elements.
$slice
Modifies the 
$push
 operator to limit the size of updated arrays.
$sort
Modifies the 
$push
 operator to reorder documents stored in an array.

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Contributed on Oct 04 2022

chifarol

0 Answers Avg Quality 2/10

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