identity function

基本解释

The IDENTITY function is a good solution for a surrogate key function in most cases.
IDENTITY 函数在大多数情况下是代理键函数的一个好的解决方案。
It is more flexible than the IDENTITY function, because it is a separate object in your database.
该函数比 IDENTITY 函数更灵活，因为它是数据库中的一个独立对象。
The reduce function is an identity function that just copies the supplied intermediate data to the output.
reduce函数是一个恒等函数，它只负责把中间数据发送到输出文件。

But they also serve another very important function, and that was the formation and maintenance of a differentiated ethnic identity or in Priestly parlance, the formation and maintenance of a holy peoples separated out from other nations by rules that mark her as God's people.
但是它们也有另外一个很重要的功能，这个功能形成并维护了,一个分化的种族身份，或者用神职人员的说法，这些规则促使了神圣民族的形成和保持,这个民族和其他的城邦区别开来，被标记为上帝的子民。
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The SIM card ( Subscriber Identity Module) in cell phones provide the same function.
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The design and engineering teams have collaborated on a visual identity that is distinct but discreet, with a motorized tilt function that directs the sound where you want it when the speakers are on, then retreats to flush when no longer needed.
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