|Cassandra is used to deal with unstructured data.
||RDBMS is used to deal with structured data.
|Cassandra has flexible schema.
||RDBMS has fixed schema.
|In Cassandra, a table is a list of "nested key-value pairs". (Row x Column Key x Column value)
||In RDBMS, a table is an array of arrays. (Row x Column)
|In Cassandra, keyspace is the outermost container which contains data corresponding to an application.
||In RDBMS, database is the outermost container which contains data corresponding to an application.
|In Cassandra, tables or column families are the entity of a keyspace.
||In RDBMS, tables are the entities of a database.
|In Cassandra, row is a unit of replication.
||In RDBMS, row is an individual record.
|In Cassandra, column is a unit of storage.
||In RDBMS, column represents the attributes of a relation.
|In Cassandra, relationships are represented using collections.
||In RDBMS, there are concept of foreign keys, joins etc.