mongodb--concept

1. Structure

(1) Relational database, database, corresponding MONGO, database

(2) Relational database, table, corresponding to MONGO, set

(3) relational database, a record, corresponding to the MONGO, a document (is a JSON structure of the data)

(4) Relational database, fields (field), corresponding to MONGO, data fields (domain, key in JSON)

(5) Relational database, primary key (primary key), corresponding to MONGO, _ID (MONGO automatically set _id as the primary key)

In MONGO, multiple data fields form a document, multiple documents form a collection, and multiple collections form a database

2. Storage comparison

mongodb--concept