Re: Input parameter nvarchar with the value NULL for the table UDF

I'm afraid neither UDF nor procedure accept null scalar params. Depending on your business case and solution requirements, you may try to assume:

• passed scalar param is null if one's length is 0
• pass and recognize unique value within function if param is null, I mean:
  
  

  select * from SP_TEST_FN_PARAM_NULL(CASE WHEN <param> is NULL THEN '<unique value>' ELSE <param> END);

  and inside your TUDF:
  
  

  return select case when :p  = '<unique value>' ...

Regards,

Michal