Обсуждение: Group by and aggregates
List, I've got a table looking something like this: my_tablesome_id int bla bla,partno varchar(100),status varchar(100),cmup numeric(14,2),qty int Here a small sample of contents in my table: some_id partno status cmup qty 1 test1 stock 10.00 15 2 test2 incoming 12.00 10 3 test1 incoming 15.00 60 4 test1 incoming 14.00 11 My SQL select statement will then group together partno, status and aggregate sum(qty) and max(cmup). This is all good and nice. My result will look something like this: partno status cmup qty test1 stock 10.00 15 test1 incoming 15.00 71 test2 incoming 12.00 10 Now, I need the first line to say "15.00" in the cmup field. That is, stock and incoming are obviously not being grouped, but since it's the same partno I'd like somehow to show the highest cmup. Is there some black SQL voodoo that'll achieve this ? TIA, -- Best Regards,Michael L. Hostbaek */ PGP-key available upon request /*
On Thu, Nov 04, 2004 at 05:54:30PM +0100, Michael L. Hostbaek wrote: > some_id partno status cmup qty > 1 test1 stock 10.00 15 > 2 test2 incoming 12.00 10 > 3 test1 incoming 15.00 60 > 4 test1 incoming 14.00 11 > > My SQL select statement will then group together partno, status and > aggregate sum(qty) and max(cmup). This is all good and nice. It would be helpful to see the exact query you're running. Based on the query output you posted below, I'd guess your query looks like this: SELECT partno, status, MAX(cmup) AS cmup, SUM(qty) AS qty FROM my_table GROUP BY partno, status ORDER BY partno, status DESC; > My result will look something like this: > > partno status cmup qty > test1 stock 10.00 15 > test1 incoming 15.00 71 > test2 incoming 12.00 10 > > Now, I need the first line to say "15.00" in the cmup field. That is, > stock and incoming are obviously not being grouped, but since it's the > same partno I'd like somehow to show the highest cmup. The query I posted above duplicates this output exactly. The cmup field in the first record is 10.00 because that's the maximum value of cmup where partno='test1' and status='stock', which is how I (and presumably you) specified the grouping to work with GROUP BY. Perhaps you want to group only by partno and not by status: SELECT partno, MAX(cmup) AS cmup, SUM(qty) AS qty FROM my_table GROUP BY partno ORDER BY partno; partno | cmup | qty --------+-------+-----test1 | 15.00 | 86test2 | 12.00 | 10 If that's not what you want, then please post the exact output you're looking for. If you want to include the status field, then please explain why a record for 'test1' and 'stock' should have a MAX(cmup) of 15.00. -- Michael Fuhr http://www.fuhr.org/~mfuhr/
Michael L. Hostbaek wrote: > List, > > I've got a table looking something like this: > > my_table > some_id int bla bla, > partno varchar(100), > status varchar(100), > cmup numeric(14,2), > qty int > > My SQL select statement will then group together partno, status and > aggregate sum(qty) and max(cmup). This is all good and nice. > > My result will look something like this: > > partno status cmup qty > test1 stock 10.00 15 > test1 incoming 15.00 71 > test2 incoming 12.00 10 > > Now, I need the first line to say "15.00" in the cmup field. That is, > stock and incoming are obviously not being grouped, but since it's the > same partno I'd like somehow to show the highest cmup. Is there some > black SQL voodoo that'll achieve this ? > You *CAN* sort by aggregates e.g. select partno, status, sum(cmup) as cmup, sum(qty) as qty from my_table group by partno, status order by partno, sum(cmup)desc; partno | status | cmup | qty --------+----------+------+----- test1 | incoming | 29 | 71 test1 | stock | 10 | 15 test2 | incoming | 12 | 10 -- Edmund Bacon <ebacon@onesystem.com>
If I understand well, you want the highest cmup for each partno, that is max(cmup) grouped by partno (only). <br /><br />You can achieve this with a subselect, and then you join the results whith the query you already have:<br /><br /> SELECTT.partno, T.status, TMP.max_cmup_for_partno, max(T.cmup) AS max_cmup, sum(T.qty) AS sum_qty<br /> FROM my_table T,(SELECT partno, max(cmup) AS max_cmup_for_partno FROM my_table GROUP BY partno) AS TMP<br /> WHERE tmp.partno=T.partno<br/> GROUP BY T.partno, TMP.max_cmup_for_partno, T.status<br /><br /> Hope it helped.<br /><br /><br/> On Thu, 2004-11-04 at 13:54, Michael L. Hostbaek wrote: <blockquote type="CITE"><pre><font color="#737373"><i>List, I've got a table looking something like this: my_tablesome_id int bla bla,partno varchar(100),status varchar(100),cmup numeric(14,2),qty int Here a small sample of contents in my table: some_id partno status cmup qty 1 test1 stock 10.00 15 2 test2 incoming 12.00 10 3 test1 incoming 15.00 60 4 test1 incoming 14.00 11 My SQL select statement will then group together partno, status and aggregate sum(qty) and max(cmup). This is all good and nice. My result will look something like this: partno status cmup qty test1 stock 10.00 15 test1 incoming 15.00 71 test2 incoming 12.00 10 Now, I need the first line to say "15.00" in the cmup field. That is, stock and incoming are obviously not being grouped, but since it's the same partno I'd like somehow to show the highest cmup. Is there some black SQL voodoo that'll achieve this ? TIA, </i></font></pre></blockquote>
On Thu, 2004-11-04 at 16:54, Michael L. Hostbaek wrote: ... > some_id partno status cmup qty > 1 test1 stock 10.00 15 > 2 test2 incoming 12.00 10 > 3 test1 incoming 15.00 60 > 4 test1 incoming 14.00 11 ... > My result will look something like this: > > partno status cmup qty > test1 stock 10.00 15 > test1 incoming 15.00 71 > test2 incoming 12.00 10 > > Now, I need the first line to say "15.00" in the cmup field. That is, > stock and incoming are obviously not being grouped, but since it's the > same partno I'd like somehow to show the highest cmup. Is there some > black SQL voodoo that'll achieve this ? junk=# select partno, status, (select max(cmup) from my_table as b where b.partno = a.partno) as cmup, sum(qty) from my_table as a group by partno, status, (select max(cmup) from my_table as b where b.partno = a.partno); partno | status | cmup | sum --------+----------+-------+-----test1 | incoming | 15.00 | 71test1 | stock | 15.00 | 15test2 | incoming | 12.00| 10 (3 rows) Oliver Elphick
Franco Bruno Borghesi (franco) writes: > If I understand well, you want the highest cmup for each partno, that is > max(cmup) grouped by partno (only). > > SELECT T.partno, T.status, TMP.max_cmup_for_partno, max(T.cmup) AS > max_cmup, sum(T.qty) AS sum_qty > FROM my_table T, (SELECT partno, max(cmup) AS max_cmup_for_partno FROM > my_table GROUP BY partno) AS TMP > WHERE tmp.partno=T.partno > GROUP BY T.partno, TMP.max_cmup_for_partno, T.status > > Hope it helped. This worked out nicely. Thank you very much ! /mich
Michael L. Hostbaek wrote: >Now, I need the first line to say "15.00" in the cmup field. That is, >stock and incoming are obviously not being grouped, but since it's the >same partno I'd like somehow to show the highest cmup. Is there some >black SQL voodoo that'll achieve this ? I think you need to join the table back on itself to get the total for each part. Not a very impressive incantation, but I'd do it in SQL like this: SELECT x.partno, x.status, y.tot, sum(x.qty) FROM my_table x, ( SELECT partno, MAX(cmup) as tot FROM my_table GROUPBY partno) y WHERE x.partno = y.partno GROUP BY x.partno, x.status, y.tot Cheers, Sam