identity function

基本解釋

The IDENTITY function is a good solution for a surrogate key function in most cases.
IDENTITY 函數(shù)在大多數(shù)情況下是代理鍵函數(shù)的一個好的解決方案。
It is more flexible than the IDENTITY function, because it is a separate object in your database.
該函數(shù)比 IDENTITY 函數(shù)更靈活，因為它是數(shù)據(jù)庫中的一個獨立對象。
The reduce function is an identity function that just copies the supplied intermediate data to the output.
reduce函數(shù)是一個恒等函數(shù)，它只負責把中間數(shù)據(jù)發(fā)送到輸出文件。

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.
但是它們也有另外一個很重要的功能，這個功能形成并維護了,一個分化的種族身份，或者用神職人員的說法，這些規(guī)則促使了神圣民族的形成和保持,這個民族和其他的城邦區(qū)別開來，被標記為上帝的子民。
耶魯公開課 - 舊約導(dǎo)論課程節(jié)選

The SIM card ( Subscriber Identity Module) in cell phones provide the same function.
FORBES: Leveraging TPM
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.
ENGADGET: Bang & Olufsen launches BeoLab 15 in-wall speakers for stealthier beats (update: ears-on)