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Article #15001MySQL og subselect i LEFT JOIN
From: Jesper Stocholm
Date: Sun, 29 Jul 2001 14:52
Date: Sun, 29 Jul 2001 14:52
27 lines
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1861 bytes
Er det korrekt, at MySQL ikke er s� god til at h�ndtere subselects ?
Jeg har f�lgende query:
select
d.Segment_Id
, d.Segment_Desc
, case when a.Segment_ID is null then 0 else 1 end as IsAlarm
from
SEGMENT_DEFINITION d
left join
(SELECT Segment_Id FROM ALARM_SEGMENT WHERE Alarm_Id = 5) a on
a.Segment_Id = d.Segment_Id
... der ikke virker.
Men hvis jeg skifter min subselect i min LEFT JOIN ud med blot et tabel-navn
(uden parenteserne), s� virker det som det skal ?
Hvor ligger fejlen ? Jeg skal lige sige, at ovent�ende query fungerer
up�klageligt p� MS SQL Svr. 2k
--
... der s�ger lejlighed fremleje/leje i K�benhavnsomr�det. Max. kr. 3500 om
m�neden alt inklusive.
- Jesper Stocholm - http://stocholm.dk
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From: Jesper Stocholm <spam@stocholm.dk>
Newsgroups: dk.edb.database
Subject: MySQL og subselect i LEFT JOIN
Date: Sun, 29 Jul 2001 14:52:40 +0000 (UTC)
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