Include group in data set if condition is met

Posted on 2013-10-23
Medium Priority
Last Modified: 2013-10-28

I need to show a group of data only if one of the records contains specific text.

In the raw data below there are two patients who have a medication list. If the data set for the patient contains the med Benedryll, then I need the set to show in the output.

select max(a.name) name, Max(b.med) med
from name a
left join medication b
on a.personID=b.PersonID
group by a.name, b.med

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The script above acts like the script I've tried (excluding the where clause) and produces the data below.

Name             Med
Fryy, Peter      Advil
Fryy, Peter      Tylenol
Fryy, Peter      Alieve
Penn, Anna      Advil
Penn, Anna      Benedryll
Penn, Anna      Tylenol
Penn, Anna      Alieve

How would I modify the script so that I only show patients who use benedryll as one of their medications?

The desired result from the script would be to show:

Name             Med
Penn, Anna      Advil
Penn, Anna      Benedryll
Penn, Anna      Tylenol
Penn, Anna      Alieve
Question by:susnewyork
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LVL 66

Accepted Solution

Jim Horn earned 2000 total points
ID: 39595076
<air code.  I do my own stunts too>
SELECT n.Name, m.Med
FROM name n
    JOIN medication m on n.personID=m.PersonID
WHERE n.Name IN (
    FROM name n
       JOIN medication m on n.personID=m.PersonID
   WHERE m.Med='Benedryll')
ORDER BY n.Name, m.Med

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LVL 69

Expert Comment

by:Scott Pletcher
ID: 39595204
Can't use name to do the match, because it might be duplicated by different personIDs.  Either way, there's no reason to do two name joins/lookups.  Also, I prefer to use EXISTS rather than IN to possibly get a better data plan:

    n.Name, m.Med
FROM dbo.medication m
INNER JOIN dbo.name n ON
    n.personID = m.personID
    EXISTS (
        SELECT 1
        FROM dbo.medication m2
            m2.personId = m.personId AND
            m2.med = 'benadryl'
    n.Name, m.Med

Author Closing Comment

ID: 39606745
This solution worked for me and produced accurate data based on my tests. Thanks.

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