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.

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