description
Conditional operators are used to compare two expressions and get data from mongoDB collections.
The conditional operators in MongoDB are:
- (>) greater than-$gt
- (<) less than-$lt
- (>=) greater than or equal to-$gte
- (<=) less than or equal to-$lte
Greater than operator (>)-$gt
If you want to get the data with "likes" greater than 100 in the "col" collection, you can use the following command:
db.col.find({likes : {$gt : 100}})Similar to the SQL statement:
Select * from col where likes > 100;Greater than or equal operator (>=)-$gte
If you want to get the data whose "likes" in the "col" collection is greater than or equal to 100, you can use the following command:
db.col.find({likes : {$gte : 100}})Similar to the SQL statement:
Select * from col where likes >=100;Less than operator (<)-$lt
If you want to get the data whose "likes" in the "col" collection is less than 150, you can use the following command:
db.col.find({likes : {$lt : 150}})Similar to the SQL statement:
Select * from col where likes < 150;Less than or equal to operator (<=)-$lte
If you want to get the data whose "likes" in the "col" collection is less than or equal to 150, you can use the following command:
db.col.find({likes : {$lte : 150}})Similar to the SQL statement:
Select * from col where likes <= 150;Combined condition operation
1. Same attribute combination query
If you want to get the data whose "likes" in the "col" collection is greater than 100 but less than 200, you can use the following command:
db.col.find({likes : {$lt :200, $gt : 100}})Similar to the SQL statement:
Select * from col where likes>100 AND likes<200;2. Combination query of different attributes
If you want to get the data with "likes" greater than 100 and "unlikes" less than 200 in the "col" collection , you can use the following command:
db.col.find({likes : {$gt : 100}, unlikes : {$lt :200}})