I read a lot of similar questions but didn't find a solution for me. Basically I would like to have a where
clause ( AND PEKP.VORGANGS_ART = 'BE'
) only if a special condition ( PFSP.EINKAUFS_KZ = 2
) is true.
I tried in many ways like that:
SELECT *
FROM PFSP
LEFT OUTER JOIN PFAK on PFSP.RUECKMELDE_NR = PFAK.RUECKMELDE_NR
LEFT OUTER JOIN PEKP ON (PFSP.BESTELL_NR=PEKP.VORGANGS_NR)
AND (PFSP.BESTELL_POS_NR=PEKP.VORGANGS_POS_NR)
LEFT OUTER JOIN PMLB ON PFSP.KOMPONENTEN_ARTIKEL_NR=PMLB.ARTIKEL_NR
WHERE PFAK.KD_VORGANGS_NR = '910-001213'
AND PFSP.RUECKMELDE_STATUS = '3'
AND PFSP.BESCHAFFUNGSKENNER = 'F'
AND CASE PFSP.EINKAUFS_KZ
WHEN 2 THEN PEKP.VORGANGS_ART = 'BE'
END
but I keep getting errors:
wrong syntax near '='"
Skip the CASE
, use AND
/ OR
instead:
AND (PFSP.EINKAUFS_KZ <> 2 OR PEKP.VORGANGS_ART = 'BE')
If PFSP.EINKAUFS_KZ
= 2, then PEKP.VORGANGS_ART
must be equal to 'BE'.
If PFSP.EINKAUFS_KZ
<> 2, it doesn't matter what PEKP.VORGANGS_ART
is.
You probably want something like:
AND (
(PFSP.EINKAUFS_KZ = 2 AND PEKP.VORGANGS_ART='BE')
OR PFSP.EINKAUFS_KZ <> 2 --You may need to catch NULL as well
)
With this CASE expression:
AND 1 = CASE
WHEN PFSP.EINKAUFS_KZ = 2 AND PEKP.VORGANGS_ART = 'BE' THEN 1
WHEN PFSP.EINKAUFS_KZ = 2 THEN 0
ELSE 1
END
The order of the conditions is important.
SELECT *
FROM PFSP
LEFT OUTER JOIN PFAK on PFSP.RUECKMELDE_NR = PFAK.RUECKMELDE_NR
LEFT OUTER JOIN PEKP ON (PFSP.BESTELL_NR=PEKP.VORGANGS_NR)
AND (PFSP.BESTELL_POS_NR=PEKP.VORGANGS_POS_NR)
LEFT OUTER JOIN PMLB ON PFSP.KOMPONENTEN_ARTIKEL_NR=PMLB.ARTIKEL_NR
WHERE PFAK.KD_VORGANGS_NR = '910-001213'
AND PFSP.RUECKMELDE_STATUS = '3'
AND PFSP.BESCHAFFUNGSKENNER = 'F'
AND ((PFSP.EINKAUFS_KZ = 2 AND PEKP.VORGANGS_ART = 'BE') OR (PFSP.EINKAUFS_KZ <> 2) )
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