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Editorial Team
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Asked: 2026-06-13T17:58:52+00:00

I’m in need of help modifying an existing case statement that has to be

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I’m in need of help modifying an existing case statement that has to be changed to accommodate the possibility of a null value.

Currently, the statement is as follows:

CASE WHEN 
  DATEDIFF(dd, table.OpenDate, GetDate()) - table.Days_as_Integer) > 0 THEN 
   DATEDIFF(dd, table.OpenDate, GetDate()) - table.Days_as_Integer 
  ELSE NULL END 
AS Days_Past_Due

I just want to change the existing CASE statement to be able to handle a null table.OpenDate field, returning a NULL as Days_Past_Due. Is there an easy way to do this?

Thanks!!!

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1 Answer

  1. Editorial Team

    Instead of making your expression more complex, you should simplify it:

    CASE WHEN 
  DATEDIFF(dd, table.OpenDate, GetDate()) - table.Days_as_Integer) > 0 THEN 
  DATEDIFF(dd, table.OpenDate, GetDate()) - table.Days_as_Integer 
  END 
AS Days_Past_Due
    1. CASE .. without an ELSE implicitly returns NULL for the ELSE branch.
    2. Datediff with either or both dates being NULL return NULL. No special magic required. Check this SQL Fiddle
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