MongoDB is a NoSQL product so the terminology is used in SQL not used in MongoDB, but the comparing SQL things with NoSQL will speedup the learning process.
|1||field||A name-value pair. It is similar concept of column of an RDBMS|
|2||document||A group of fields are termed as document. In RDBMS we will term it as row. MongoDB document follows JSON syntax but it is a BSON syntax (BSON is an extended version of JSON implemented by MongoDB).|
|3||collection||A group of documents called collection in MongoDB. A collection is similar concept of table of an RDBMS.|
|4||database||A Physical Container for Collections. Each database gets its own set of files on the file system. A single MongoDB server typically has multiple databases|
Let’s view this Table presents the various SQL terminology and concepts and the corresponding MongoDB terminology and concepts.
|SQL Terms||MongoDB Terms|
|row||document or BSON document|
|table joins||embedded documents and linking|
Specify any unique column or
column combination as primary key.
|primary key |
In MongoDB, the primary key is automatically
set to the _id field.
|aggregation (e.g. group by)||aggregation pipeline|
|SQL Concepts||MongoDB |
The following table presents some database executables and the corresponding MongoDB executables. This table is not meant to be exhaustive.
|Database Server||mongod||mysqld||oracle||IDS||DB2 Server|
|Database Client||mongo||mysql||sqlplus||DB-Access||DB2 Client|