You can use the $substr function in MongoDB to extract a substring from a string. This function uses the following basic syntax:…
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MongoDB: How to Concatenate Strings from Two Fields
by Tutor AspireYou can use the following syntax to concatenate strings from two fields into a new field in MongoDB: db.myCollection.aggregate([ { $project: {…
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How to Replace Strings in MongoDB (With Example)
by Tutor AspireYou can use the following syntax to replace a specific string in a field in MongoDB: db.myCollection.updateMany( { fieldName: { $regex: /old/…
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MongoDB: How to Calculate the Sum of a Field
by Tutor AspireYou can use the following methods to calculate the sum of values in a field in MongoDB: Method 1: Calculate Sum of…
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MongoDB: How to Select a Random Sample of Documents
by Tutor AspireYou can use the following syntax to select a random sample of documents from a collection in MongoDB: db.myCollection.aggregate([ { $sample: {…
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MongoDB: How to Use “Not Equal” in Queries
by Tutor AspireYou can use the $ne operator (which stands for “not equal”) in MongoDB to query for documents where a field is not…
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MongoDB: How to Use Greater Than & Less Than in Queries
by Tutor AspireYou can use the following operators in MongoDB to perform greater than or less than queries: $lt: Less than $lte: Less than…
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MongoDB: How to Insert if Not Exists
by Tutor AspireYou can use the following syntax to insert a document into a collection in MongoDB only if it doesn’t already exist: db.teams.update(…
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MongoDB: How to Round Values to Decimal Places
by Tutor AspireYou can use the $round operator in MongoDB to round numeric values to a certain number of decimal places. This operator uses…
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MongoDB: How to Check if Field Exists
by Tutor AspireYou can use the following methods to check if a field exists in a collection in MongoDB: Method 1: Check if Field…