Multiple Counts with single query in mongodb

Question

I am new to Mongo Db and would appreciate some help with this query. I have been sifting through posts here for the past couple of days tearing my hair to see if I could fin

Answer 1

You can use below aggregation.

$gt > null - to check whether field exists or not in aggregation expressions.

$cond with $sum to output 0 and 1 based on release date filter.

$add to add both released and unreleased count to output total.

db.Movies.aggregate([
 {"$group":{
   "_id":null,
   "Unreleased":{"$sum":{"$cond":[{"$and":[{"$gt":["$ReleaseDate",null]},{"$ne":["$ReleaseDate",""]}]},0,1]}},
   "Released":{"$sum":{"$cond":[{"$and":[{"$gt":["$ReleaseDate",null]},{"$ne":["$ReleaseDate",""]}]},1,0]}}
 }},
 {"$addFields":{"Total":{"$add":["$Unreleased","$Released"]}}}
])