Database Tutorials

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 sum of values in a field in MongoDB: Method 1: Calculate Sum of…

You can use the following syntax to select a random sample of documents from a collection in MongoDB: db.myCollection.aggregate([ { $sample: {…

You can use the $ne operator (which stands for “not equal”) in MongoDB to query for documents where a field is not…

You can use the following operators in MongoDB to perform greater than or less than queries: $lt: Less than $lte: Less than…

You can use the following syntax to insert a document into a collection in MongoDB only if it doesn’t already exist: db.teams.update(…

You can use the $round operator in MongoDB to round numeric values to a certain number of decimal places. This operator uses…