SQL Join with results in one line with multiple conditions

Question

First post, new to the forum!
I have two tables which I am querying from, as an example
select a.f_name || a.l_name, case when b.bodypart='Arm' then ='Arm' end, case when b.bodypart='Leg' then 'Leg' end
from person a
join bodyparts b on b.person_id=a.person_id
where b.bodypart in ('Arm','Leg')
What this gives is something like:
BobNewhart Arm (null)
BobNewhart (null) Leg
I am trying to get the following results:
BobNewhard Arm Leg
This is just an example, but this should give a valid picture of the issue which i am having.
Thank you for any help!
Richie

Answer 1

Hi,
Like Whitehat said, use GROUP BY. You don't need a sub-query; just GROUP BY the name, and use MIN or MAX around the CASE expressions:
SELECT        a.f_name || a.l_name
,        MAX ( CASE
             WHEN b.bodypart='Arm'
             THEN ='Arm'
             END
           )          AS arm
,        MAX ( CASE
             WHEN b.bodypart='Leg'
             THEN ='Leg'
             END
           )          AS leg
FROM       person           a
JOIN       bodyparts      b  ON      b.person_id     = a.person_id
WHERE       b.bodypart      IN ('Arm','Leg')
GROUP BY  a.f_name || a.l_name
;Since there will only be one value (at most) in the arm and leg columns, it doesn't matter if you use MIN or MAX.