unique-key
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Varchar with trailing spaces as a Primary Key in SQL Server 2008
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[详细]
2022-12-14 22:36 分类：问答Is it bad to use user name as primary key in database design?
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[详细]
2022-12-13 02:44 分类：问答
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