Solved

SQL Query question

Posted on 2015-02-24
8
100 Views
Last Modified: 2015-02-26
Hi Experts,

We have the following authorization table.

ID (PK)
PatientsID (Int)
EffectiveFrom (DateTime)
EffectiveTo (DateTime)

Now I would like to have a list of all gaps between authorizations.

Meaning if a patient had an auth 1/1/15 to 1/10/15 and another auth 1/11/15 to 1/30/15 and another one 1/31/15 to 2/15/15, that means there is no gap between authorizations, while if the last auth would be from 2/1/15 to 2/15/15 that would be considered a gap and record of last records should show up, including a number 1 which would be the count of days without auth (1/31/15).
0
Comment
Question by:bfuchs
[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
  • 4
  • 4
8 Comments
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 40629853
If you are using Access for this, try the following.  Because of the non-equijoin, you will only be able to edit this in the SQL view.  This should also work in SQL Server, but I'm guessing that there are more efficient ways to do it in SQL Server.

SELECT ID, PatientsID, EffectiveFrom, EffectiveTo, NextFrom
FROM (
SELECT T1.ID, T1.PatientsID, T1.EffectiveFrom, T1.EffectiveTo
, Min(T2.EffectiveFrom) as NextFrom
FROM yourTable T1
LEFT JOIN yourTable T2
ON T1.PatientsID = T2.PatientsID
AND T1.EffectiveTo < T2.EffectiveFrom
) as sub
WHERE (NextFrom IS NULL)
OR (NextFrom - EffectiveTo >= 2)
0
 
LVL 4

Author Comment

by:bfuchs
ID: 40629869
Hi,
See attached.
Untitled.png
0
 
LVL 47

Accepted Solution

by:
Dale Fye (Access MVP) earned 500 total points
ID: 40629876
Oops, forgot the Group By clause in the subquery:

SELECT ID, PatientsID, EffectiveFrom, EffectiveTo, NextFrom
FROM (
SELECT T1.ID, T1.PatientsID, T1.EffectiveFrom, T1.EffectiveTo
, Min(T2.EffectiveFrom) as NextFrom
FROM yourTable T1
LEFT JOIN yourTable T2
ON T1.PatientsID = T2.PatientsID
AND T1.EffectiveTo < T2.EffectiveFrom
GROUP BY T1.ID, T1.PatientsID, T1.EffectiveFrom, T1.EffectiveTo
) as sub
WHERE (NextFrom IS NULL)
OR (NextFrom - EffectiveTo >= 2)
0
Visualize your virtual and backup environments

Create well-organized and polished visualizations of your virtual and backup environments when planning VMware vSphere, Microsoft Hyper-V or Veeam deployments. It helps you to gain better visibility and valuable business insights.

 
LVL 4

Author Comment

by:bfuchs
ID: 40629890
OK this already gave me some records, however before really testing I realized the following
1- It gives me records for patients that have only 1 auth.
2- also the one's without next from date I assume have no following auth should be omitted.
3- records that have no dates entered on EffectiveFrom or EffectiveTo are also showing up.
4- I Actually only need to see records of the last 3 months, where do I enter this condition?
0
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 40630284
Not sure what you exactly mean by #4, so you can change the following as necessary.
Modify the WHERE clause to:

WHERE  (EffectiveFrom IS NOT NULL)
AND (EffectiveTo IS NOT NULL)
AND (NextFrom IS NOT NULL)
AND (EffectiveFrom >= DateAdd("m", -3, Date()))
AND (NextFrom-EffectiveTo) >=2
0
 
LVL 4

Author Comment

by:bfuchs
ID: 40632003
@Dale,

I'm waiting for user to test, hopefully by tom will know if this works.

Thanks,
Ben
0
 
LVL 4

Author Closing Comment

by:bfuchs
ID: 40634246
Thanks Dale this worked out well.
0
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 40634311
glad I could help.
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

In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
Access custom database properties are useful for storing miscellaneous bits of information in a format that persists through database closing and reopening.  This article shows how to create and use them.
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

733 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