In this chapter, we looked at the basics of a Cassandra data model and are now familiar with the column, row, column family, keyspace, counter, and other related terms. A comparison of the main differences between a relational data model and the Cassandra data model was also given to explain the concept of modeling by query that may seem shocking and counterintuitive at first sight. Then a few important considerations on data modeling and typical usage patterns were introduced. Finally, the reason why the introduction of CQL is deliberately postponed was expressed.

This chapter is only the first part on Cassandra data modeling. In the next chapter, we will continue the second part of the tour, Cassandra Query Language.