Solved

Delete unwanted rows

Posted on 2013-06-15
5
235 Views
Last Modified: 2013-07-01
I have a table "TreatmentData" defined as:

create table #TreatmentData(
 
  PatientId nvarchar(18),
  TreatedWith nvarchar(30) );

The table lists patient treatments.  A patient can have many rows in the table.  There are six possible values for TreatedWith.

I need to delete all the patient records where the patient has "NoTreatment" for all his/her rows in the database.  i.e. they have visited the clinic but not been treated.

I imagine it must be where the number of rows is equal to the count where the TreatedWith is "NoTreatment" when grouped by PatientId...

but i just can not get my head round it.

Any suggestions?
0
Comment
Question by:soozh
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 16

Assisted Solution

by:Surendra Nath
Surendra Nath earned 250 total points
ID: 39250522
the below query might help you out

;with CTE as
(
 select PatientId,TreatedWith  from #TreatmentData group by PatientId,TreatedWith 
), CTE1 AS
(
 select PatiendID from CTE C WHERE NOT EXISTS ( select 1 FROM CTE C1 where C1.PatiendID = C.PatiendID and C1.TreatedWith  <> 'NoTreatment')
)
DELETE T
FROM #TreatmentData T
JOIN CTE1 C
ON T.PatiendID = C.PatiendID

Open in new window

0
 
LVL 5

Expert Comment

by:DOSLover
ID: 39250869
Essentially what we are saying here is that delete the patient record if we find only 'NoTreatment' records for that patient:
Delete from TreatmentData a
 where exists 
       (Select PatientId from TreatmentData b
	     where b.PatientId = a.PatientId
		   and b.TreatedWith = 'NoTreatment')
   and NOT exists 
       (Select PatientId from TreatmentData b
	     where b.PatientId = a.PatientId
		   and b.TreatedWith <> 'NoTreatment')

Open in new window

0
 
LVL 32

Accepted Solution

by:
Ephraim Wangoya earned 250 total points
ID: 39251119
Here

with cte as
(
  select *
  from TreatmentData
  where TreatedWith <> 'NoTreatment'
)

delete from TreatMentData
where not exists(select 1 
                           from cte A
                           where TreatmentData.PatientID = A.PatientID)

Open in new window

0
 
LVL 25

Expert Comment

by:chaau
ID: 39252003
Just kidding: when you apply all the SQL statements against you treatment table that you have asked during last week, you will probably end up with a nice empty table. Ha-ha
0
 
LVL 32

Expert Comment

by:awking00
ID: 39253464
delete from treatmentdata
where patientid in
(select patientid from treatmentdata where treatedwith = 'NoTreatment'
 except
 select patientid from treatmentdata where treatedwith <> 'NoTreatment')
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

In this article I will describe the Detach & Attach method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
In this article I will describe the Backup & Restore method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

710 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question