Hi all,
I'll first of all explain the purpose of the query. I've built a database to record the admission details of patients admitted to hospital. Amongst other things, the database captures date/time of admission and date/time of discharge.
The query I am building needs to show patients with multiple admissions, and in particular, the number of days that have elapsed since they were last discharged. Within my query is the following subquery that I had written to show this aspect of it:
Note: "CHI Number" is a unique reference number assigned to every patient.
I then display in a column [Admission Date] - [Previous Discharge].
This works fine where a patient only has one previous admission. However, where a patient has multiple admission, the subquery always returns that patient's first discharge date instead of their most recent discharge date (because I have used the "TOP 1" predicate). It seems that it should be straightforward enough, however I can't seem to work around it. Anything I try results in errors, and so I keep defaulting back to my "TOP 1" solution.
ie. What I want it to show is:
Name.......Admission Date...Discharge Date.... Previous Discharge... Days Between Admissions
Joe Bloggs ..01/01/2014 .......10/01/2014
Joe Bloggs ..15/01/2014 .......20/01/2014 .......10/01/2014 ..............5
Joe Bloggs ..27/01/2014 .......01/02/2014 ........20/01/2014 .............7
However, what it actually shows is:
Name ......Admission Date ...Discharge Date ...Previous Discharge ...Days Between Admissions
Joe Bloggs ..01/01/2014 ......10/01/2014
Joe Bloggs ..15/01/2014 ......20/01/2014 ........10/01/2014 .............5
Joe Bloggs ..27/01/2014 ......01/02/2014 ........10/01/2014 .............17
Any help?
I'll first of all explain the purpose of the query. I've built a database to record the admission details of patients admitted to hospital. Amongst other things, the database captures date/time of admission and date/time of discharge.
The query I am building needs to show patients with multiple admissions, and in particular, the number of days that have elapsed since they were last discharged. Within my query is the following subquery that I had written to show this aspect of it:
Note: "CHI Number" is a unique reference number assigned to every patient.
I then display in a column [Admission Date] - [Previous Discharge].
This works fine where a patient only has one previous admission. However, where a patient has multiple admission, the subquery always returns that patient's first discharge date instead of their most recent discharge date (because I have used the "TOP 1" predicate). It seems that it should be straightforward enough, however I can't seem to work around it. Anything I try results in errors, and so I keep defaulting back to my "TOP 1" solution.
ie. What I want it to show is:
Name.......Admission Date...Discharge Date.... Previous Discharge... Days Between Admissions
Joe Bloggs ..01/01/2014 .......10/01/2014
Joe Bloggs ..15/01/2014 .......20/01/2014 .......10/01/2014 ..............5
Joe Bloggs ..27/01/2014 .......01/02/2014 ........20/01/2014 .............7
However, what it actually shows is:
Name ......Admission Date ...Discharge Date ...Previous Discharge ...Days Between Admissions
Joe Bloggs ..01/01/2014 ......10/01/2014
Joe Bloggs ..15/01/2014 ......20/01/2014 ........10/01/2014 .............5
Joe Bloggs ..27/01/2014 ......01/02/2014 ........10/01/2014 .............17
Any help?
