The isnull function literally just checks if the value is null. It will not work if the string is empty(" "). – Max Pringle. Mar 5, 2018 at 16: ... ... <看更多>

Showing a lack of data is not user-friendly. Let's see how we can change this.My SQL Server Udemy courses are:70-461, 70-761 Querying ... ... <看更多>

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How to display NULL, NOT NULL and empty values in SQL server Videos SQL How to attach database mdf file in sql server and fix an error ... ... <看更多>

Text version of the videohttp://csharp-video-tutorials.blogspot.com/2017/03/how-to-check-guid-is- null-or-empty -in.htmlHealthy diet is very ... ... <看更多>

I would say that NULL is the correct choice for "no email address". There are many "invalid" email addresses, and "" (empty string) is just one. ... <看更多>