sql server 2005 - Computed bit column that returns whether another column is null -

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I try to keep this calculation column: 

  create table dbo.Item (ItemId int no net identification (1, 1), special ITI int null, - I tried this ASSISTANT ISUML (Special ITMID, 0) & gt; I have tried that SSIISI is not a special ITMID - both work Do not do) [primary]

This works: 

  create tabletdb.itim (i IDID INIT INID IT Null Identity (1, 1), Special ITIM Input Null, ISASTIPIAL ITeST Cast (Case IZNool (Special ITMID 0), as 0 BSE-1 AD bit))

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