I have a registration form in which users can fill in two email address (email1 & email2). Marketing\'s requirement is that they need to be unique (unique as in if we had 10 users开发者_运维问答,
I am using SQL Server 2008, had a table with an id (numeric) column as the primary key.Also had a unique index on three varchar columns. I was able to add a row with the exact same set of the three co
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