A super column is a tuple (a pair) with a binary super column name and a value that maps it to many columns. They consist of a key–value pairs, where the values are columns. Theoretically speaking, super columns are (sorted) associative array of columns. Similar to a regular column family where a row is a sorted map of column names and column values, a row in a super column family is a sorted map of super column names that maps to column names and column values.
A super column is part of a keyspace together with other super columns and column families, and columns.
Code example Written in the JSON-like syntax, a super column definition can be like this:
{ "databases": { "Cassandra": { "age": 20, "name": { "firstName": "Cassandra", "lastName": "apache"
}, "HBase": { "age": 20, "address": { "city": "Seoul", "postcode": "1234"
}Where:
"databases" are keyspace;
"Cassandra" and "HBase" are rowKeys;
"name" and "address" are super column names;
"firstName", "city", "age", etc. are column names.
See also Column (data store) Keyspace (distributed data store) Super column family
References
External links The Apache Cassandra data model