Difference Between Primary Key and Unique Key

Primary key unique key difference detailed practical implementation.
If anyone see this video carefully this concept will never forget lifetime. But only necessity to watch video carefully. It is very important concept. This video becomes quite long But is very useful who loves sql.
this is concept important acccording to interview point. Many interview asks this question.
At the time of interview many intelligent candidates get confuse.
Even though some see the answer and remember the answer they forget .
So this video made in detail. As viewer , student, people watch this video. They get exact view of each point. There are 4 major differences explain in detail.
The point explain practically. so there is no chance of forget. If anybody see the video from start to end without miss single thing. That person will not forget this difference.
It is guarantee that the person without technical background see this video carefully he can also remember the concept lifetime.
I personally always want answer of this question. But I can't find satisfactory videos on this topic.
I have presented those things, which I personally always expected in concern with this topic.
so try to see whole video without skip. nothing will loss but gain a lot and gain lifetime benefit .

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