The partitioning key needs to be on a column or set of columns that are highly unique thus ensuring that the data will be evenly distributed across all the partitions that the table is defined on.

分区键需要位于高度惟一的一列或一组列上，从而确保数据均匀分布在该表所定义的所有分区上。

youdao

Despite having spent months preparing for launch, there are no ads yet, save for a set of unique house ads extolling the benefits of advertising on the site.

尽管网站上线准备工作历时数月，但除了一套独特的夸耀在本站做广告如何有利的自家广告外，网站还没能拉到广告。

youdao

Similarly, each site needs to determine which global campaigns are presented on the site, and to set up campaigns unique to the business audience addressed by the specific site.

类似地，每个站点需要确定在站点上呈现哪个全球化的活动，以及设置对于指定站点提出的业务客户的特有活动。

youdao

Unlike a smartphone, a watch is always in direct contact with the skin, which means it can relay a unique set of data on body functions.

FORBES: On Second Thought, Maybe That Apple iWatch Will Be A Timely Product After All

While recognizing the daunting scale of the challenge, the UNESCO report describes independence as unique opportunity to set South Sudan on a new trajectory towards more dynamic growth, shared prosperity and common security.

UNESCO: EDUCATION

The teams spent their time on Friday analysing the set-ups they will need at the unique Monza track, the fastest on the F1 calendar.

BBC: Sebastian Vettel heads Ferrari pair in Monza practice