MongoDB
How to Replace Strings in MongoDB (With Example)
You can use the following syntax to replace a specific string in a field in MongoDB:
db.myCollection.updateMany(
{ fieldName: { $regex: /old/ } },
...
Aggregation in MongoDB
MongoDB: How to Calculate the Sum of a Field
You can use the following methods to calculate the sum of values in a field in MongoDB:
Method 1: Calculate Sum of Field
db.collection.aggregate()
Method 2: Calculate...
MongoDB
MongoDB: How to Select a Random Sample of Documents
You can use the following syntax to select a random sample of documents from a collection in MongoDB:
db.myCollection.aggregate()
This particular example selects a random sample...
MongoDB
MongoDB: How to Use “Not Equal” in Queries
You can use the $ne operator (which stands for “not equal”) in MongoDB to query for documents where a field is not equal to...
MongoDB
MongoDB: How to Use Greater Than & Less Than in Queries
You can use the following operators in MongoDB to perform greater than or less than queries:
$lt: Less than
$lte: Less than or equal
$gt: Greater than
$gte:...
MongoDB
MongoDB: How to Insert if Not Exists
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(
{
team :...
MongoDB
MongoDB: How to Round Values to Decimal Places
You can use the $round operator in MongoDB to round numeric values to a certain number of decimal places.
This operator uses the following basic...
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