Embodiments of this application disclose a query method and apparatus, and a device, so that a network management device obtains a situation in which a YANG model object on a network device is licensed. The method includes: The network management device generates a query message, where the query message includes a query condition, and the query condition is used to determine a first mapping relationship between license information and information about a YANG model object. The network management device sends the query message to a first device. The network management device receives a response message obtained by the first device based on the query condition, where the response message includes the first mapping relationship.