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A colleague tried to clue me in on OLAP functions (new SQL support
V5R4). Of course when I tried the simplest one I could think of, it
failed with the spectacular message SQL0255 'Function not supported for
query.' Reason code 6.
Go read the book some more. Find out that there are restrictions. This
is the one that applies: a table referenced directly or indirectly in
the fullselect must not be a DDS-created logical file. In the case of
the example statement (below) it refers specifically to a PF, but of
course the optimiser may choose a logical file if it prefers (although
debug doesn't tell me because it error out before telling me.)
Whaaaaa? Who has a database without any DDS logical files? Must be
some large SQL-only server customer is all I can figure. OLAP is quite
useless to me with this restriction.
select rank() over (order by state) as rank,state,count(*)
from custfile
group by state
order by rank,state
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