Database Tutorials

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…

You can use the following methods to check if a field exists in a collection in MongoDB: Method 1: Check if Field…

You 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…

You can use the $or operator in MongoDB to query for documents that meet one of multiple criteria. This operator uses the…

You can use the $and operator in MongoDB to query for documents that meet multiple criteria. This operator uses the following basic…

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:…