SQL Server EXCEPT
-
03-07-2019 - |
Question
Here's the situation I'm in. I have a table containing peoples' information. Some of them are imported from another system while some are imported manually. What I would like to do is pull everyone in, but if there is a record entered manually and a record that was imported, I want to select only the imported one (since it is likely more up to date).
Here is what I have so far, but it doesn't seem to work (it only returns the manually entered records):
SELECT --fields go here
FROM
(
SELECT PERSON_UID, instype
FROM AdmitsInterfaceTable
WHERE instype='M' --Manually entered people
EXCEPT
SELECT PERSON_UID, instype
FROM AdmitsInterfaceTable
WHERE instype='I' --Imported people
) P,
AdmitsInterfaceTable A
WHERE
P.PERSON_UID=A.PERSON_UID
AND P.instype=A.instype
I have a feeling this isn't working because of the inner query also pulling in the instype column, but I can't think of any better ways to do this. Any advice?
Solution
SELECT PERSON_UID, instype
FROM AdmitsInterfaceTable a
WHERE instype='I' --get all imported people
union -- plus all manuals who are not also imported
SELECT PERSON_UID, instype
FROM AdmitsInterfaceTable a
WHERE instype='M' --Imported people
and not exists ( -- without imported matches
select * from FROM AdmitsInterfaceTable b
WHERE instype='I' and b.person_uid = a.person_uid);
OTHER TIPS
you could try:
SELECT CASE WHEN b.person_UID is null THEN a.person_UID ELSE person_UID END,
CASE WHEN b.person_UID is null THEN a.instype ELSE instype END
--and so forth through all the columns you want
FROM
(SELECT PERSON_UID, instype -- add list of additional fields you need here
from AdmitsInterfaceTable WHERE instype='M' ) A
LEFT JOIN
(SELECT PERSON_UID, instype -- add list of additional fields you need here
from AdmitsInterfaceTable WHERE instype='I' ) B on A.PERSON_UID = B.PERSON_UID
SELECT --fields go here
FROM AdmitsInterfaceTable A
WHERE
P.PERSON_UID=A.PERSON_UID
AND P.instype=A.instype
AND instype='M' --Manually entered people
AND person_uid not in (
SELECT PERSON_UID FROM AdmitsInterfaceTable
WHERE instype='I' --Imported people
)
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