sql - Unique constraint excluding NULLs in UDT field -

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i using sql server 2012 , have following user defined table type

create type [dbo].[identifiercodetable] table(     [id] [dbo].[identifier] null,     [code] [dbo].[code] null )

i trying enforce id must unique except null values. have following code , working fine non null values when try insert 2 null values not allow me it.

create type [dbo].[identifiercodetable] table(     [id] [dbo].[identifier] null,     [code] [dbo].[code] null,     unique(id) )

is there way exclude null values unique constraint can in regular indexes filter?

i think need know (it sql server 2008 think applies sql server 2012 either).

a nonclustered index cannot created on user-defined table type unless index result of creating primary key or unique constraint on user-defined table type. (sql server enforces unique or primary key constraint using index.)

source: https://technet.microsoft.com/en-us/library/bb522526%28v=sql.105%29.aspx


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