You can use the following methods to check if a field exists in a collection in MongoDB: Method 1: Check if Field…
Database Tutorials
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MongoDB: How to List All Field Names
by Tutor AspireYou can use the following syntax to list all field names in a collection in MongoDB: Object.keys(db.myCollection.findOne()) This particular example lists every…
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MongoDB: How to Use the OR ($or) Operator in Queries
by Tutor AspireYou can use the $or operator in MongoDB to query for documents that meet one of multiple criteria. This operator uses the…
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MongoDB: How to Use the AND ($and) Operator in Queries
by Tutor AspireYou can use the $and operator in MongoDB to query for documents that meet multiple criteria. This operator uses the following basic…
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How to Rename Fields in MongoDB (3 Examples)
by Tutor AspireYou can use the following methods to rename fields in MongoDB: Method 1: Rename One Field db.collection.updateMany({}, {$rename:{“oldField”:”newField”}}, false, true) Method 2:…
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MongoDB: How to Find Length of String
by Tutor AspireYou can use the following methods to find the length of a string in MongoDB and use this string length in queries:…
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MongoDB: How to Calculate the Average Value of a Field
by Tutor AspireYou can use the following methods to calculate the average value of a field in MongoDB: Method 1: Calculate Average of Field…
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MongoDB: How to Sort by Multiple Fields
by Tutor AspireYou can use the following syntax to sort documents in MongoDB by multiple fields: db.myCollection.find().sort( { “field1”: 1, “field2”: -1 } )…
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How to Calculate the Median Value in MongoDB
by Tutor AspireYou can use the following syntax to calculate the median value in MongoDB: db.teams.find().sort( {“points”:1} ).skip(db.teams.count() / 2).limit(1); Note that in this…
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MongoDB: How to Group by Date
by Tutor AspireYou can use the following syntax to group documents by date in MongoDB: db.collection.aggregate([ {$group:{ _id:{$dateToString:{format: “%Y-%m-%d”, date: “$day”}}, count:{ $sum: 1}}}…