Comparison Query Operators (비교쿼리 오퍼레이터)

$eq : equal ‘=’ {<field>:{$eq:<value>}

$gt : greater than ‘>’

$gte : greater than or equal ‘>=’

$in : 배열내에 특정값의 존재여부

$lt : less then ‘<‘

$lte : less then ‘<=’

$ne : not equal ‘!’

$nin : none of the values in an array

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