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 $round operator in MongoDB to round numeric values to a certain number of decimal places.
This operator uses the following basic...
MongoDB
MongoDB: How to Check if Field Exists
You can use the following methods to check if a field exists in a collection in MongoDB:
Method 1: Check if Field Exists
db.myCollection.find({ "myField": {...
MongoDB
MongoDB: How to List All Field Names
You can use the following syntax to list all field names in a collection in MongoDB:
Object.keys(db.myCollection.findOne())
This particular example lists every field name in a...
MongoDB
MongoDB: How to Use the OR ($or) Operator in Queries
You can use the $or operator in MongoDB to query for documents that meet one of multiple criteria.
This operator uses the following basic syntax:
db.myCollection.find({
...
MongoDB
MongoDB: How to Use the AND ($and) Operator in Queries
You can use the $and operator in MongoDB to query for documents that meet multiple criteria.
This operator uses the following basic syntax:
db.myCollection.find({
"$and":...
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