💡 MongoDB 공식문서를 참고하였다. 참고 : https://docs.mongodb.com/manual/tutorial/project-fields-from-query-results/ Project Fields to Return from Query — MongoDB Manual Docs Home → MongoDB Manual➤ Use the Select your language drop-down menu in the upper-right to set the language of the following examples.By default, queries in MongoDB return all fields in matching documents. To limit the amount of data that..