SYSCAT.COLDIST contains entries for a certain table only if distribution statistics have been collected for at least one of its columns.

仅在收集了一个表中至少一个列的分布统计信息时，SYSCAT.COLDIST 才会包含关于该表的条目。

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You can define guidelines that influence only a few attributes of an execution plan, such as index specification for a certain table in the query or join order for a pair of tables.

可以定义那些只影响执行计划的某些属性的准则，比如查询中的某个表的索引说明，或者一对表的连接顺序。

youdao

You can define guidelines that influence only a few attributes of an execution plan, such as index specification for a certain table in the query or join order for a pair of tables.

可以定义那些只影响执行计划的某些属性的准则，比如查询中的某个表的索引说明，或者一对表的连接顺序。

youdao