查询，更新，投影以及聚合操作符

• 查询、更新以及投影操作符快速入门

• 查询和更新操作符:

  $addToSet
• $all
• $and
• $bit
• $box
• $center
• $centerSphere
• $comment
• $each
• $elemMatch (query)
• $exists
• $explain
• $geoIntersects
• $geoWithin
• $geometry
• $gt
• $gte
• $hint
• $in
• $inc
• $isolated
• $lt
• $lte
• $max
• $maxDistance
• $maxScan
• $min
• $mod
• $natural
• $ne
• $near
• $nearSphere
• $nin
• $nor
• $not
• $or
• $orderby
• $polygon
• $pop
• $ (query)
• $pull
• $pullAll
• $push
• $pushAll
• $query
• $regex
• $rename
• $returnKey
• $set
• $setOnInsert
• $showDiskLoc
• $size
• $slice
• $snapshot
• $sort
• $type
• $uniqueDocs
• $unset
• $where

• 投影操作符:

  $elemMatch (projection)
• $ (projection)
• $slice (projection)

• 聚合操作符:

  $add (aggregation)
• $addToSet (aggregation)
• $and (aggregation)
• $avg (aggregation)
• $cmp (aggregation)
• $concat (aggregation)
• $cond (aggregation)
• $dayOfMonth (aggregation)
• $dayOfWeek (aggregation)
• $dayOfYear (aggregation)
• $divide (aggregation)
• $eq (aggregation)
• $first (aggregation)
• $geoNear (aggregation)
• $group (aggregation)
• $gt (aggregation)
• $gte (aggregation)
• $hour (aggregation)
• $ifNull (aggregation)
• $last (aggregation)
• $limit (aggregation)
• $lt (aggregation)
• $lte (aggregation)
• $match (aggregation)
• $max (aggregation)
• $millisecond (aggregation)
• $min (aggregation)
• $minute (aggregation)
• $mod (aggregation)
• $month (aggregation)
• $multiply (aggregation)
• $ne (aggregation)
• $not (aggregation)
• $or (aggregation)
• $project (aggregation)
• $push (aggregation)
• $second (aggregation)
• $skip (aggregation)
• $sort (aggregation)
• $strcasecmp (aggregation)
• $substr (aggregation)
• $subtract (aggregation)
• $sum (aggregation)
• $toLower (aggregation)
• $toUpper (aggregation)
• $unwind (aggregation)
• $week (aggregation)
• $year (aggregation)