[Home](./index.md) > [@firebase/database](./database.md) > [Query](./database.query.md) ## Query interface Signature: ```typescript export interface Query ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [ref](./database.query.ref.md) | [Reference](./database.reference.md) | | ## Methods | Method | Description | | --- | --- | | [endAt(value, key)](./database.query.endat.md) | | | [equalTo(value, key)](./database.query.equalto.md) | | | [get()](./database.query.get.md) | | | [isEqual(other)](./database.query.isequal.md) | | | [limitToFirst(limit)](./database.query.limittofirst.md) | | | [limitToLast(limit)](./database.query.limittolast.md) | | | [off(eventType, callback, context)](./database.query.off.md) | | | [on(eventType, callback, cancelCallbackOrContext, context)](./database.query.on.md) | | | [once(eventType, successCallback, failureCallbackOrContext, context)](./database.query.once.md) | | | [orderByChild(path)](./database.query.orderbychild.md) | | | [orderByKey()](./database.query.orderbykey.md) | | | [orderByPriority()](./database.query.orderbypriority.md) | | | [orderByValue()](./database.query.orderbyvalue.md) | | | [startAt(value, key)](./database.query.startat.md) | | | [toJSON()](./database.query.tojson.md) | | | [toString()](./database.query.tostring.md) | |