我数据库中的记录是
{"_id":"1","fn":"sagar","ln":"Varpe"}
{"_id":"1","fn":"sag","score":"10"}
{"_id":"1","ln":"ln1","score":"10"}
{"_id":"1","ln":"ln2"}
我需要设计一个MongoDB查询来查找具有给定密钥的所有记录.
例如，如果我将ln作为参数传递给查询，它将返回所有记录，其中ln是一个键.结果将是
{"_id":"1","fn":"sagar","ln":"Varpe"}
{"_id":"1","ln":"ln1","score":"10"}
{"_id":"1","ln":"ln2"}