From MongoDB 4.0, you can use the $toDouble aggregation pipeline operator to convert a value to a double.
Tag: operators
MongoDB $toDecimal
From MongoDB 4.0, you can use the $toDecimal aggregation pipeline operator to convert a value to a decimal.
MongoDB $toBool
From MongoDB 4.0, you can use the $toBool aggregation pipeline operator to convert a value to a boolean.
MongoDB $sortByCount Aggregation Operator
In MongoDB the $sortByCount aggregation pipeline stage groups incoming documents based on the value of a specified expression, then computes the count of documents in each distinct group.
Each group is output in its own document, which consists of two fields:
- an
_idfield containing the distinct grouping value, and - a
countfield containing the number of documents belonging to that grouping.
The documents are sorted by count in descending order.
MongoDB $count Aggregation Operator
In MongoDB the $count aggregation operator passes a document to the next stage in the aggregation pipeline that contains a count of the number of documents input to the current stage.
SQL Greater Than (>) Operator for Beginners
In SQL, the greater than operator (>) compares two expressions and returns TRUE if the left operand has a value higher than the right operand; otherwise, it returns FALSE.
SQL Greater Than or Equal To (>=) Operator for Beginners
In SQL, the greater than or equal to operator (>=) compares two expressions and returns TRUE if the left operand has a value greater than or equal to the right operand; otherwise, it returns FALSE.
SQL Less Than or Equal To (<=) Operator for Beginners
In SQL, the less than or equal to operator (<=) compares two expressions and returns TRUE if the left operand has a value lower than or equal to the right operand; otherwise, the result is FALSE.
You can use it to determine whether a value is less than or equal to another value.
Continue readingSQL Less Than (<) Operator for Beginners
In SQL, the less than operator (<) compares two expressions and returns TRUE if the left operand has a value lower than the right operand; otherwise, the result is FALSE.
SQL Not Equal To (<>) Operator for Beginners
In SQL, the not equal to operator (<>) compares the non-equality of two expressions. That is, it tests whether one expression is not equal to another expression.
If either or both operands are NULL, NULL is returned.
SQL also has another not equal to operator (!=), which does the same thing. Which one you use may depend on your DBMS, which one you’re the most comfortable using, and perhaps also whether your organisation has any coding conventions that dictate which one should be used.