How to perform grouping like a daisy chain

Question

Hi:
I have a database table of Building Inspections (InspectionID) for each Building Permit (PermittingID).  Sometimes the inspections fail and have to be re-inspected. I do not relate each re-inspection to the original inspection.  I relate each re-inspection
to the inspection being re-inspected.  I am using daisy chain logic. 
For example:
PermittingID     InspectionID     ReinspectionRequestNum     InspStatus
       3                     3591                                                              
F
       3                     3843                          
3591                            F
       3                     4437                          
3843                            F
       3                     4777                          
4437                            F         
       3                     5069                        
  4777                            F       
       3                     5204                          
5069                            F
       3                     5242                          
5204                            F
I have been asked to create a report of ONLY the inspections/re-inspections that have failed and continue to fail (like above example). This includes any inspections that failed and were never reinspected. 
For example:
PermittingID     InspectionID     ReinspectionRequestNum     InspStatus
       17                     8                                                                  
F
       17                     11                        
                                        F
       17                     16                          
                                      F
       17                    236                          
                                     F         
       17                    237                       
                                        F       
       17                    238                          
                                     F
I must Exclude any inspections that have failed, but ultimately passed. 
For example I would exclude ALL below:
PermittingID     InspectionID     ReinspectionRequestNum     InspStatus
     105                     38                                                              
F
     105                     76                          
38                                P
PermittingID     InspectionID     ReinspectionRequestNum     InspStatus
       3                     3480                                                             
F
       3                     3669                          
3480                           F
       3                     3942                          
3669                           P
Any help is greatly appreciated with a query to filter out all inspections that have eventually passed.
Thank you.
Carmelita

Answer 1

Hi CKCOMPUTER,
Regarding your description, are you trying to exclude the records which has the  'P' InspStatus? I am confused by the last sample with the PermittingID 3, I noticed that at the very above the records with 3 were mentioned not being excluded. If that
is a typo, you may reference the below query to achieve your requirement.
CREATE TABLE BuildingInspection(PermittingID INT,InspectionID INT,ReinspectionRequestNum INT,InspStatus CHAR(1));
INSERT INTO BuildingInspection VALUES(3,3591,NULL,'F');
INSERT INTO BuildingInspection VALUES(3,3843,3591,'F');
INSERT INTO BuildingInspection VALUES(3,4437,3843,'F');
INSERT INTO BuildingInspection VALUES(3,4777,4437,'F');
INSERT INTO BuildingInspection VALUES(3,5069,4777,'F');
INSERT INTO BuildingInspection VALUES(3,5204,5069,'F');
INSERT INTO BuildingInspection VALUES(3,5242,5204,'F');
INSERT INTO BuildingInspection VALUES(17, 8 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(17, 11 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(17, 16 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(17, 236 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(17, 237 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(17, 238 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(105, 38 ,NULL,'F');
INSERT INTO BuildingInspection VALUES(105, 76 ,38,'P');
SELECT * FROM BuildingInspection BI WHERE NOT EXISTS(SELECT 1 FROM BuildingInspection WHERE InspStatus='P' AND PermittingID=BI.PermittingID );
DROP TABLE BuildingInspection;
If the records with 3 are in the same table with the 3s above, please clarify the correlation.
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support