1. Dead Patients Visiting
Farrokh Alemi, PhD

2. Conversion of Text to Double
If text “Null” appears
Convert to Double
Replace with true Null

3. Query in Graphical View
Check for age at diagnosis > age at death
No Duplicate ID

4. SQL View SELECT DxAge_1.id FROM DxAge_1 WHERE DxAge_1.AgeAtDx >
IIf([AgeAtDeath] = "Null", Null, CDbl([AgeAtDeath]))
GROUP BY DxAge_1.id;

5. 43 Patients Visit after Death in File 1
Repeat for four different data files. Then, create a union of the result.

6. Exclude Dead Patients in File 1

7. Exclude Dead Patients in File 1
SELECT DxAge_1.id
, DxAge_1.icd9
, DxAge_1.AgeAtDx
, DxAge_1.AgeAtFirstDM
, DxAge_1.AgeAtDeath
, VisitAfterDeath.id
FROM VisitAfterDeath RIGHT JOIN DxAge_1
ON VisitAfterDeath.id = DxAge_1.id
WHERE VisitAfterDeath.id Is Null;

8. Reduced Rows of Data in File 1 Repeat for All Four Files
From 4,233,546 To 4,231,775
Reduced Rows of Data in File 1
Repeat for All Four Files