March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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Expression comparison operators
Comparison operators can be used in conjunction with Boolean operators to construct the expressions that we need to evaluate as true/false for the output of our pipeline's stage.
The most commonly used operators are as follows:
- $eq ( equal )
- $ne ( not equal)
- $gt (greater than)
- $gte (greater than or equal)
- $lt
- $lte
All the aforementioned mentioned operators return a Boolean value of true or false.
The only operator that doesn't return a Boolean value is $cmp, which returns 0 if the two arguments are equivalent, 1 if the first value is greater than the second and -1 if the second value is greater than the first.
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