$gt
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Definition
$gtSyntax:
{ field: { $gt: value } }$gtselects those documents where the value of thefieldis greater than (i.e.>) the specifiedvalue.For most data types, comparison operators only perform comparisons on fields where the BSON type matches the query value's type. MongoDB supports limited cross-BSON comparison through Type Bracketing.
Examples
The following examples use the inventory collection. Create the
collection:
db.inventory.insertMany( [ { "item": "nuts", "quantity": 30, "carrier": { "name": "Shipit", "fee": 3 } }, { "item": "bolts", "quantity": 50, "carrier": { "name": "Shipit", "fee": 4 } }, { "item": "washers", "quantity": 10, "carrier": { "name": "Shipit", "fee": 1 } } ] )
Match Document Fields
Select all documents in the inventory collection where quantity
is greater than 20:
db.inventory.find( { quantity: { $gt: 20 } } )
Example output:
{ _id: ObjectId("61ba25cbfe687fce2f042414"), item: 'nuts', quantity: 30, carrier: { name: 'Shipit', fee: 3 } }, { _id: ObjectId("61ba25cbfe687fce2f042415"), item: 'bolts', quantity: 50, carrier: { name: 'Shipit', fee: 4 } }
Perform an Update Based on Embedded Document Fields
The following example sets the price field based on a $gt
comparison against a field in an embedded document.
db.inventory.updateOne( { "carrier.fee": { $gt: 2 } }, { $set: { "price": 9.99 } } )
Example output:
{ _id: ObjectId("61ba3ec9fe687fce2f042417"), item: 'nuts', quantity: 30, carrier: { name: 'Shipit', fee: 3 }, price: 9.99 }, { _id: ObjectId("61ba3ec9fe687fce2f042418"), item: 'bolts', quantity: 50, carrier: { name: 'Shipit', fee: 4 } }, { _id: ObjectId("61ba3ec9fe687fce2f042419"), item: 'washers', quantity: 10, carrier: { name: 'Shipit', fee: 1 } }
This updateOne() operation searches for an
embedded document, carrier, with a subfield named fee. It sets
{ price: 9.99 } in the first document it finds where fee has a
value greater than 2.
To set the value of the price field in all documents where
carrier.fee is greater than 2, use
updateMany().