Introduction to CQL

Cassandra Query Language

Accessing data using CQL: Common ways to access data include cqlsh, drivers, and DataStax Studio.
Understanding the CQL command syntax: Basic rules and limitations for writing CQL statements; including case, valid characters, escaping characters, keyspace qualifiers, commenting, keywords, and exponential notation.
About system keyspace tables: Provides details about database objects and cluster configuration in the system keyspace tables. Modifying the system keyspace is not supported; modification attempts generate an error message.
Virtual keyspaces and tables: Provides details about virtual keyspaces and tables.
Virtual tables for SAI indexes and SSTables: Provides details about virtual tables for Storage Attached Indexing (SAI) indexes and SSTables.