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All in the (column) family
Now enter a name for your column family and set "column_type" to "Super" (a super column allows variable subcolumns in each row). Pick data types for the "compare_with" and "default_validation class" options (I used "AsciiType" in this instance), then click the "Save Column Family" button.
Now the dialogs disappear and your keyspace should appear in the list. At this point we're ready to enter data, but we're going to do that from another tool: the CLI (command line interface) client.
The almighty bin folder
Open up a File Explorer window and head over to the bin folder. The default location for this folder on a 64-bit Windows machine is C:\Program Files (x86)\DataStax Community\apache-cassandra\bin. A bunch of important files are here, including the cassandra-cli.bat file, which runs the CLI client, and the cqlsh Python script, which runs the Cassandra Query Language (CQL) Shell.
Double-click the cassandra-cli.bat file to load the CLI client now.