I am new to cassandra, I was looking at the offical document. I can find that the table concept in cassandra is very similar to the RDBMS.
The https://cassandra.apache.org/doc/latest/cql/index.html will teach me how to create table, insert table, etc.
But below is from https://www.tutorialspoint.com/cassandra/cassandra_data_model.htm.
It said Unlike relational tables where a column family’s schema is not fixed, Cassandra does not force individual rows to have all the columns. The following figure shows an example of a Cassandra column family.
My question I can not find this design in current cassandra, below is the screenshot I run some simple insert command.
Since I only insert two columns INSERT INTO emp (emp_id, emp_city) VALUES (5, 'abc'), so the rest will be set null, it's very similar to general rdbms.
So could you tell me how can I implment the 'different rows have different columns' in the first picture? Thanks very much.