Null or empty check for a string variable

sql sql-server-2008 null null-check
Bharath picture Bharath · Apr 18, 2013 · Viewed 155.7k times · Source 
if((isnull(@value,''))='')

I want to know whether the above piece of code works in checking if the variable is null or empty.

Answer

Guffa picture Guffa · Apr 18, 2013

Yes, that code does exactly that.

You can also use:

if (@value is null or @value = '')

Edit:

With the added information that @value is an int value, you need instead:

if (@value is null)

An int value can never contain the value ''.

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