I just wrote a query against our EMR database to give me the first and
last of a series of observations. I came up with the following, which
appears to work, but I was wondering if anyone had any thoughts on how
to do it more efficiently. I don't like those correlated subqueries
just to get a max and a min, but I don't know that there's a better
way.
Thanks!
SELECT person.lastname, person.firstname, obshead.name, obs.obsdate,
obs.obsvalue, obs2.obsdate, obs2.obsvalue
FROM ml.Person Person
JOIN ml.rptObs Obs ON Person.pID = Obs.pID
JOIN ml.ObsHead ObsHead ON Obs.hdID = ObsHead.hdID
JOIN ml.rptObs Obs2 ON Obs.pID = Obs2.pID
AND Obs.hdID = Obs2.hdID
AND Obs.obsDate < obs2.obsDate
WHERE ObsHead.name LIKE 'SF-12%'
AND Obs.obsDate = (SELECT MIN(obsDate)
FROM ml.RptObs Obs3
WHERE Obs3.pID = obs.pID
AND Obs3.hdID = obs.hdID)
AND Obs2.obsDate = (SELECT MAX(obsDate)
FROM ml.RptObs Obs4
WHERE Obs4.pID = obs2.pID
AND Obs4.hdID = obs2.hdID)
ORDER BY Person.lastname, Person.firstname, Obs.obsdate, obshead.name
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