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Articles by Anvi Jain
Page 10 of 43
MongoDB query to fetch elements between a range excluding both the numbers used to set range?
To fetch elements between a range in MongoDB while excluding both boundary numbers, use the $gt (greater than) and $lt (less than) operators together in your query. Syntax db.collectionName.find({ fieldName: { $gt: lowerBound, $lt: upperBound } }); For including both boundary numbers, use $gte and $lte operators ? db.collectionName.find({ fieldName: { $gte: lowerBound, $lte: upperBound } }); Sample Data db.returnEverythingBetween50And60.insertMany([ {"Amount": 55}, {"Amount": 45}, {"Amount": 50}, ...
Read MoreHow to insert an 8-byte integer into MongoDB through JavaScript shell?
To insert an 8-byte integer into MongoDB through JavaScript shell, use the NumberLong() constructor to create a 64-bit integer value. This ensures proper storage of large integer values that exceed JavaScript's standard number precision. Syntax anyVariableName = {"yourFieldName": new NumberLong("yourValue")}; Example Create a variable with an 8-byte integer ? userDetail = {"userId": new NumberLong("98686869")}; { "userId" : NumberLong(98686869) } Display Variable Value Display the variable using the variable name ? userDetail { "userId" : NumberLong(98686869) } Display the variable ...
Read MoreMongoDB query for fields in embedded document?
To query fields in embedded documents in MongoDB, use dot notation to navigate through the nested structure. For arrays of embedded documents, MongoDB searches through all array elements and returns the entire document when a match is found. Syntax db.collection.find({"arrayName.fieldName": value}); Sample Data Let us first create a collection with embedded documents: db.embeddedDocumentDemo.insertOne({ "CustomerDetails": [ {"CustomerName": "Chris", "CustomerPurchasePrice": 3000}, {"CustomerName": "Robert", "CustomerPurchasePrice": 4500}, {"CustomerName": ...
Read MoreHow do you update a MongoDB document while replacing the entire document?
To update a MongoDB document while replacing the entire document, use the update() or replaceOne() method without update operators like $set. This replaces all fields except the _id field. Syntax db.collection.update( { filter }, { newDocument } ); // Or use replaceOne() (recommended) db.collection.replaceOne( { filter }, { newDocument } ); Sample Data Let us first create a collection with a document: db.replacingEntireDocumentDemo.insertOne({ "StudentFirstName": "John", "StudentLastName": "Smith", ...
Read MoreMongoDB Query to combine AND & OR?
To combine AND & OR operators in MongoDB, use the $and and $or operators together to create complex query conditions. This allows you to match documents that satisfy multiple logical combinations. Syntax db.collection.find({ "$or": [ { "$and": [{ field1: value1 }, { field2: value2 }] }, { field3: value3 } ] }); Sample Data db.combinedAndOrDemo.insertMany([ { "StudentFirstName": ...
Read MorePerforming distinct on multiple fields in MongoDB?
To perform distinct on multiple fields in MongoDB, use the $group operator with the aggregation framework. The $addToSet operator collects unique values for each field across all documents. Syntax db.collection.aggregate([ { $group: { _id: null, field1: { $addToSet: "$field1" }, field2: { $addToSet: "$field2" }, ...
Read MoreHow to set limit to $inc in MongoDB?
To set a limit to $inc in MongoDB, use a query condition with comparison operators like $lt to only increment values that meet specific criteria. This prevents incrementing values beyond a desired threshold. Syntax db.collection.updateMany( { fieldName: { $lt: limitValue } }, { $inc: { fieldName: incrementValue } } ); Create Sample Data db.limitIncrementDemo.insertMany([ { "StudentId": 101, "StudentScore": 95 }, { "StudentId": 102, "StudentScore": 55 }, { "StudentId": 103, "StudentScore": 67 }, ...
Read MoreFind objects created in last week in MongoDB?
To find objects created in the last week in MongoDB, use the $gte operator with a date calculation that subtracts 7 days from the current date. This filters documents with dates greater than or equal to one week ago. Syntax db.collection.find({ "dateField": { $gte: new Date(new Date() - 7 * 60 * 60 * 24 * 1000) } }); Sample Data Let us first create a collection with documents to demonstrate the query ? db.findObjectInLastWeekDemo.insertMany([ ...
Read MoreWhat does createdCollectionAutomatically mean in MongoDB?
The createdCollectionAutomatically field in MongoDB indicates whether an operation automatically created a collection that didn't exist. When you perform operations like createIndex() or insert() on a non-existing collection, MongoDB creates the collection automatically and returns this boolean flag as true. Syntax db.nonExistingCollection.createIndex({fieldName: 1}); // Returns: { "createdCollectionAutomatically": true, "numIndexesBefore": 1, "numIndexesAfter": 2, "ok": 1 } Example 1: Creating Index on Non-Existing Collection Let us create an index on a collection that doesn't exist ? db.createCollectionDemo.createIndex({"ClientCountryName": ...
Read MoreQuery for multiple parameters in MongoDB?
To query for multiple parameters in MongoDB, use multiple field-value pairs in the query document separated by commas. For nested fields, use dot notation to access specific properties within embedded documents or arrays. Syntax db.collection.find({ "field1": "value1", "field2": "value2", "nestedField.subField": "value3" }); Sample Data db.multipleParametersDemo.insertMany([ { "CustomerName": "Larry", "CustomerDetails": [ ...
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