Hey - -- -- -
My brain is hurting over this one. This is running on a MySQL engine
through SPT.
Issue: In a class training application, I am trying to get the next
logical sequence of classes by part.
Problem: The PK value of the table is determining the records that are
selected in the GROUP BY rather than the stated ORDER BY.
Data Situation (simplified):
PK_VAL Part ClassWhen
200 1 2009-12-01 08:00:00
201 2 2009-12-01 13:00:00
100 1 2009-12-07 08:00:00
101 2 2009-12-07 13:00:00
102 3 2009-12-08 08:00:00
103 4 2009-12-08 13:00:00
With the SQL:
SELECT pk_val,part,ClassWhen
from my_sched
where ClassWhen >= 2009-12-01 00:00:00
group by part
order by part,ClassWhen
(a single "group by" is allowed by MySQL, just like "set enginebehavior
70")
I get:
100 1 2009-12-07 08:00:00
101 2 2009-12-07 13:00:00
102 3 2009-12-08 08:00:00
103 4 2009-12-08 13:00:00
Somehow the PK_VAL is "winning" in the group by, rather than the
explicitly-stated order.
I want to get:
200 1 2009-12-01 08:00:00
201 2 2009-12-01 13:00:00
102 3 2009-12-08 08:00:00
103 4 2009-12-08 13:00:00
Ideas? What am I missing with this? (Will the magic "Send" button lift
the veil from my eyes?)
Thanks,
Ken
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