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Group Aggregation Operators
Name |
Description |
$addToSet |
Returns an array of all the unique values for the selected field among for each document in that group. |
$first |
Returns the first value in a group. |
$last |
Returns the last value in a group. |
$max |
Returns the highest value in a group. |
$min |
Returns the lowest value in a group. |
$avg |
Returns an average of all the values in a group. |
$push |
Returns an array of all values for the selected field among for each document in that group. |
$sum |
Returns the sum of all the values in a group. |