MongoDb

db.article.aggregate(
  { $filter : { author : { $eq : "Joe Bloggs" } } }
);
{ name: { $not: { $eq: "Andrea Le" } } }
The following query filter uses the $lte operator to find all documents
where version is less than or equal to 4.
{ version: { $lte: 4 } }
The following query filter uses the $gt operator and Date() method to find all 
documents where the dateCreated field value is later than June 22nd, 2000.
{ dateCreated: { $gt: Date('2000-06-22') } }

< First groupBy and condition in mongodb >

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