troubleshooting Question

Dealing with NuLL Values returns no data

Avatar of Becky Edwards
Becky EdwardsFlag for United States of America asked on
Microsoft SQL ServerSQL
15 Comments1 Solution92 ViewsLast Modified:
I want to filter out patients who have a 1, or a 2 in the following field, leaving patients who either have a NULL value or any of the other values.

When I put in this filter
pt.PATIENT_TYPE_C not in (1,2) 
it doesn't return anyone because the patients currently have all NULL values in that field.

1      Anonymous
2      Confidential
3      Employee
4      Dismissed
5      Verified with no Medicare
6      Prisoner
7      VIP

How can I write my filter to account for the NULL value?
Éric Moreau
Senior .Net Consultant
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