Database Tutorials

You 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:…

You can use the following methods to find the length of a string in MongoDB and use this string length in queries:…

You can use the following syntax to split a string into an array of substrings in MongoDB: db.myCollection.aggregate([ { $project: { split_field:…

You can use the $substr function in MongoDB to extract a substring from a string. This function uses the following basic syntax:…

You can use the following syntax to concatenate strings from two fields into a new field in MongoDB: db.myCollection.aggregate([ { $project: {…

You can use the following syntax to replace a specific string in a field in MongoDB: db.myCollection.updateMany( { fieldName: { $regex: /old/…

You can use the following methods to calculate the average value of a field in MongoDB: Method 1: Calculate Average of Field…

You can use the following syntax to sort documents in MongoDB by multiple fields: db.myCollection.find().sort( { “field1”: 1, “field2”: -1 } )…

You 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…

You 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}}}…