In MongoDB, the $round aggregation pipeline operator rounds a number to a whole integer or to a specified decimal place.
You have the option of specifying how many decimal places for which to round the number. To do this, pass a second argument. The first argument is the number to round, and the second (optional) argument is the number of decimal places to round it to.
Continue readingWhen using mongoimport, you can use the --jsonArray parameter to import an array of JSON documents.
In MongoDB, you can use the cursor.explain() method or the db.collection.explain() method to determine whether or not a query uses an index.
These methods enable you to view the query plan for the query, which includes whether or not it uses an index.
Continue readingIn MongoDB, the $sample aggregation pipeline stage randomly selects the specified number of documents from its input.
In MongoDB, the $rand aggregation pipeline operator returns a random float between 0 and 1.
The floating point value has up to 17 digits after the decimal point. Any trailing zeros are dropped, so the number of digits may vary.
The $rand operator was introduced in MongoDB 4.4.2.
If you encounter error Msg 15123, Level 16, reading “The configuration option ‘Agent XPs’ does not exist“, you were probably trying to execute EXEC SP_CONFIGURE 'Agent XPs' while advanced options are hidden.
This error is easily fixed.
Continue readingIn MongoDB, the $nin query operator selects the documents where the field’s value is not in the specified array or where the field doesn’t exist.
In MongoDB, the $ne aggregation pipeline operator compares two values and returns either true or false, depending on whether the two values are not equivalent.
In MongoDB, the $in aggregation pipeline operator returns a boolean indicating whether a specified value is in the array.
The $in aggregation pipeline operator is not to be confused with the $in query operator, which selects the documents where the value of a field equals any value in the specified array.
In MongoDB, the $in query operator selects the documents where the value of a field equals any value in the specified array.
The $in query operator is not to be confused with the $in aggregation pipeline operator, which returns a boolean indicating whether a specified value is in the array.