什么是复合键和使用 [英] what is composite key and use

问题描述

什么是复合键？当我们要使用

解决方案

Google是你的朋友：好好经常拜访他。他可以比在这里发布问题更快地回答问题...



使用您的主题非常快速的搜索，因为搜索词给出了1.82亿次点击： https://www.google.co.uk/search?q=composite+key&oq=composite+key&aqs=chrome..69i57&sourceid=chrome&es_sm=93&ie=UTF-8 [ ^ ]



其中，第二个和第三个非常简洁准确：

http://www.sqa.org.uk/e-学习/ MDBS01CD / page_19.htm [ ^ ]

http://www.techopedia.com/definition/6572/composite-key [ ^ ]



将来，请尽量自己做至少基础研究，不要浪费你的时间或我们的时间。

从这里开始这里，此处或此处。< br $>


小型演示：

http： //lmgtfy.com/?q=Composite+keys+ [ ^ ]

what is composite key? when we are going to use

解决方案

Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...

A very quick search using your subject as the search term gave 182 million hits: https://www.google.co.uk/search?q=composite+key&oq=composite+key&aqs=chrome..69i57&sourceid=chrome&es_sm=93&ie=UTF-8[^]

Of which, the second and third are pretty concise and accurate:
http://www.sqa.org.uk/e-learning/MDBS01CD/page_19.htm[^]
http://www.techopedia.com/definition/6572/composite-key[^]

In future, please try to do at least basic research yourself, and not waste your time or ours.

Start from here here, here or here.

A small demo:
http://lmgtfy.com/?q=Composite+keys+[^]

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