I think its the same as that of IF ELSE. For some reason, I'm out of this, still thanks for trying to help.
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Issue with IFNULL and DEFAULT(col) when JOINing tables!
This doesn't work as expected (the IFNULL clause):
SELECT IFNULL(b.fld1, default(b.fld1)) AS col,
FROM a
LEFT JOIN b ON b.id = a.fld1_id
JOIN c ON c.id = a.fld2_id
WHERE a.fld1_id=5
But, this works (returns 2.5 when b.fld1 is null):
SELECT IFNULL(b.fld1, 2.5) AS col,
FROM a
LEFT JOIN b ON b.id = a.fld1_id
JOIN c ON c.id = a.fld2_id
WHERE a.fld1_id=5
and this works too (returns the default value when fld1 is null):
SELECT IFNULL(fld1, default(fld1)) AS col FROM b;
Please advise!!
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by: shru_0409Posted on 2009-11-02 at 06:45:57ID: 25719757
SELECT case where b.fld1 is null then default(b.fld1) else b.fld1 end ) AS col,
FROM a
LEFT JOIN b ON b.id = a.fld1_id
JOIN c ON c.id = a.fld2_id
WHERE a.fld1_id=5
try this
or i didn't find any issue in your query