unique vs primary key

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Till
04 Jan 2018
1What is the difference between UNIQUE and PRIMARY KEY constraints? 
2There should be only one PRIMARY KEY 
3in a table whereas there can be
4any number of UNIQUE Keys.
5PRIMARY KEY doesn’t allow NULL
6values whereas Unique key allows NULL values.
7
Christian
21 Oct 2016
1What is the difference between UNIQUE and PRIMARY KEY constraints? 
2There should be only one PRIMARY KEY 
3in a table whereas there can be
4any number of UNIQUE Keys.
5PRIMARY KEY doesn’t allow NULL
6values whereas Unique key allows NULL values.
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