PRIMARY KEY (column_list)

Uniquely identifies rows, determines storage partitions, and orders data (clustering columns) within a partition.

A NULL value cannot be inserted into a PRIMARY KEY column. This restriction applies to both partition keys and clustering columns.


Defines a partition and clustering columns, which affects how the data in stored.

  • Compound primary key: the first column is the partition key, and the additional columns are clustering keys. Syntax: PRIMARY KEY (<partition_column_name>, <clustering_column_name> [, ...])

  • Composite partition key: Multiple columns in the partition key. Enclose the partition key columns in parentheses. Syntax: PRIMARY KEY ((<partition_column_name>[, ...]),<clustering_column_name> [, ...])

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