Re: Is this possible? concatenating results from a subquery
От | Janko Richter |
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Тема | Re: Is this possible? concatenating results from a subquery |
Дата | |
Msg-id | c65v4t$qf$1@news.hub.org обсуждение исходный текст |
Список | pgsql-hackers |
Perhaps this helps: CREATE AGGREGATE concat ( BASETYPE = text, SFUNC = textcat, -- is function of operator 'text || text' STYPE = text, INITCOND = '' ); SELECT P.personid, P.name, concat( N.note ) AS allnotesbythisperson FROM tblperson AS P INNER JOIN tblnotes AS N ON N.personid=P.personid WHERE P.personid=34 GROUP BY P.personid, P.name; Regards, Janko Erwin Moller wrote: > Hi! > > I face the following problem: > 2 tables: tblperson and tblnotes > tblperson: > colums: personid (PK), name > > tblnotes: > colums: noteid(PK), personid(references tblperson(personid)), note > > tblnotes has notes stored written by a person from tblperson identified (FK) > by its personid. > > I make a select on one table with certain criteria and want to have a > concatenation on a subquery results. > Something like this: > > SELECT > P.personid, > P.name, > concat(SELECT N.note FROM tblnotes AS N WHERE (N.personid=P.personid) ) > AS allnotesbythisperson > FROM tblperson AS P WHERE (P.personid=34); > > The concat word I use is pure fantasy. > Is this at all possible? > > I know I can easily circumvent te problem by my scriptinglanguage (PHP), but > that will result in many extra queries. > > How do I proceed? > > TIA!! > > Regards, > Erwin Moller >
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