> -----Original Message----- > From: John R Pierce [mailto:pierce@xxxxxxxxxxxx] > Sent: Thursday, February 11, 2010 3:01 PM > To: pgsql-general@xxxxxxxxxxxxxx > Subject: Re: help with SQL join > > Neil Stlyz wrote: > > Now... here is the problem I am having... the above SQL query is > > retrieving results from one table: sales I have another > table called > > customers with a couple of fields (customerid, and customername are > > two of the fields). > > I want to join on the customerid in both tables to retrieve the > > customername in the query. > > So I need the results to look something like this: > > > > customerid | customername | > > TODAYS_USERS | LAST 7 DAYS | > LAST 30 DAYS > > bigint | varchar | > > bigint | bigint > > > | bigint > > > -------------------------------------------------------------- > ------------------------------------------------------------------ > > 8699 | Joe Smith | > 1 > > | > > 1 | 1 > > 8700 | Sara Olson | > 1 > > | 12 > > | 17 > > 8701 | Mike Jones | > 3 > > | > > 5 | 19 > > > > Can someone show me how to use a JOIN with the above SQL > Statement? I > > need to bring the customername field into the query from the other > > table and I have been having issues writting the query... can this > > even be done? > > something like... > > SELECT results.customerid, c.customername, count(distinct > count1) AS "TODAYS_USERS", count(distinct count2) AS "LAST 7 > DAYS" , count(distinct count3) AS "LAST 30 DAYS" > FROM (SELECT distinct case when s.modified >= > '2010-02-11' then s.modelnumber else null end as count1, > case when s.modified >= '2010-02-04' then > s.modelnumber else null end as count2, > case when s.modified >= '2010-01-11' then > s.modelnumber else null end as count3, s.customerid > FROM sales as s WHERE s.modelnumber LIKE 'GH77%') > AS results > JOIN customers as c ON (results.customerid = c.customerid) > GROUP BY results.customerid > One correction: you should "group" on all non-aggregate columns in your "select" list, i.e.: SELECT results.customerid, c.customername, count(distinct count1) AS "TODAYS_USERS", count(distinct count2) AS "LAST 7 DAYS" , count(distinct count3) AS "LAST 30 DAYS" FROM (SELECT distinct case when s.modified >= '2010-02-11' then s.modelnumber else null end as count1, case when s.modified >= '2010-02-04' then s.modelnumber else null end as count2, case when s.modified >= '2010-01-11' then s.modelnumber else null end as count3, s.customerid FROM sales as s WHERE s.modelnumber LIKE 'GH77%') AS results JOIN customers as c ON (results.customerid = c.customerid) GROUP BY results.customerid, c.customername Igor Neyman -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
