In MongoDB, the $gte aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is greater than or equal to the second value.
Category: DBMS
Database Management Systems
MongoDB $ifNull
In MongoDB, $ifNull is an aggregation pipeline operator that allows you to specify a value to use in place of null.
The way that it works is, you provide an expression and a replacement expression. If the expression evaluates to a non-null value, that expression is returned. But if the expression evaluates to a null value, $ifNull returns the value of the replacement expression.
A null value includes instances of undefined values or missing fields.
Continue readingMongoDB $gt Aggregation Pipeline Operator
In MongoDB, the $gt aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is greater than the second value.
MongoDB $lte Aggregation Pipeline Operator
In MongoDB, the $lte aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is less than or equal to the second value.
MongoDB $lt Aggregation Pipeline Operator
In MongoDB, the $lt aggregation pipeline operator compares two values and returns either true or false, depending on whether or not the first value is less than the second value.
How to Prettify Exported MongoDB Documents in mongoexport
When you use mongoexport to export documents in MongoDB, you have the option of “prettifying” them.
By this I mean, instead of the document being presented on one long line, it instead includes line breaks, indents, etc to make it easier to read.
To do this in mongoexport, use the --pretty parameter.
MongoDB $filter
In MongoDB, the $filter aggregation pipeline operator returns a subset of an array based on a specified condition.
The $filter operator returns an array with only those elements that match the condition, in their original order.
5 Ways to Check the Size of a Collection in MongoDB
In this article I present 5 ways that you can use to check the size of a MongoDB collection when using the mongo shell.
Continue readingHow to Fix “Procedure expects parameter ‘@statement’ of type ‘ntext/nchar/nvarchar’.” Error in SQL Server
It’s quite easy to encounter error Msg 214, Level 16 when executing stored procedures such as sp_executesql or sp_describe_first_result_set.
Fortunately it’s easy to fix too!
The most common reason for getting this error is that you forgot to prefix your string with N.
Therefore, to fix this issue, try prefixing your string with N.
MongoDB $exp
In MongoDB, the $exp aggregation pipeline operator raises Euler’s number (i.e. e ) to the specified exponent and returns the result.
The exponent can be any valid expression that resolves to a number.
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