Is it possible to have a varchar col开发者_StackOverflow中文版umn as a primary key with values like \'a \' and \'a\', is gives always this error \"Violation of PRIMARY KEY constraint\" in MS SQL Serve
I was told by a friend: What unique key do you use? I hope you are not saving the entire user name --- this will use up too much table space! Assign an unique userID to each
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