A column storage is similar to a Key-Value storage. The difference is in the key structure

Column families in a columnar database are the basic units for specifying access control and rights for different user groups

A key in a Column Family Model contains: (i) table row number; (ii) table column identifier; (iii) column family identifier; (iv) time stamp of the value

The key values in a column database are lexicographically ordered

The Column Family Model is the mapping of a big 2+ dimensional table into one column

A Column Family Store is good for time-series data

Like in Relational model or in a spreadsheet, the Columnar Data Model supports only atomic data values that are placed in a cell of a table

Column Data Model is the extension of the relational Model to cope with time series

Column Data Storage stores different columns of the table at separate server nodes in a Cloud