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CMCITD
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SQL Query--is not excluding a segment of my data

I have the following code;

select distinct pt.person_id, p.last_name, p.first_name, p.address_line_1, p.city, p.state, p.zip from 
patient_ pt
INNER JOIN vital_signs_ vs ON vs.person_id = pt.person_id
INNER JOIN patient_problems pp ON pp.person_id = pt.person_id
INNER JOIN lab_results_obx lr ON lr.person_id = pt.person_id
INNER JOIN person p on p.person_id = pt.person_id
where pt.age >= 18 AND vs.BMI_calc >= 22 
and ((lr.obs_id like '25000000^GLUCOSE^' and CAST(lr.observ_value  AS decimal)>100) OR (lr.obs_id like '%FM HEM A1C^HEMOGLOBIN A1C^I%')  
and NOT EXISTS (select NULL from patient_problems p1 where (  description  like 'Diabetes%')
AND pt.person_id = p1.person_id))
order by p.last_name desc

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When I check my data--everythings appears correct, except for this;

and NOT EXISTS (select NULL from patient_problems p1 where (  description  like 'Diabetes%')
AND pt.person_id = p1.person_id))

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I have patients showing up that have Diabetes listed in their patient problem table.  The exact name of the patient_problem is 'Diabetes Type II' so the like statement should be catching it.

  I had posted this previously and after checking data, thought it was clean--however after I went 20+ names in diabetic patients started showing up.  Thanks!
SQL

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CMCITD

8/22/2022 - Mon
lcohan

I believe that's due to NULL comparison which doesn't work like that - please try updated code below:

select distinct pt.person_id, p.last_name, p.first_name, p.address_line_1, p.city, p.state, p.zip
from patient_ pt
INNER JOIN vital_signs_ vs ON vs.person_id = pt.person_id
INNER JOIN patient_problems pp ON pp.person_id = pt.person_id
INNER JOIN lab_results_obx lr ON lr.person_id = pt.person_id
INNER JOIN person p on p.person_id = pt.person_id
where pt.age >= 18 AND vs.BMI_calc >= 22
      and ((lr.obs_id like '25000000^GLUCOSE^' and CAST(lr.observ_value  AS decimal)>100) OR (lr.obs_id like '%FM HEM A1C^HEMOGLOBIN A1C^I%')  
      and NOT EXISTS (select person_id from patient_problems p1 where (  description  like 'Diabetes%')
      AND pt.person_id = p1.person_id))
order by p.last_name desc
CMCITD

ASKER
Ok--tried that code---same patients are still appearing
ASKER CERTIFIED SOLUTION
lcohan

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CMCITD

ASKER
Sorry was in a clinic in the last couple of days, thanks so much!
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