Primary Key Columns 主键字段名
Example 3: Collect catalog statistics on key columns
示例 3：收集关键列上的目录统计信息
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Example 3 shows how you collect statistics on key columns.
示例3展示如何收集关键列(key column)上的统计信息。
The key columns on both the tables cannot be compressed.
两个表中的关键列不能被压缩。
The column family is organized by customer ID (primary key), you have columns for first name, last name, address, and all the normal customer information, plus as many rows as are needed for each purchase.
FORBES: What You Need to Know About NoSQL Databases
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