Database Manual / Reference / Query Language / Update

Field Update Operators

Note

For details on a specific command, including syntax and examples, click on the link to the command's reference page.

NameDescription

$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.