Hi all, I have the following tables (parent and two children)
CREATE SEQUENCE person_seq;
CREATE TABLE person(_id integer DEFAULT nextval('person_seq') NOT NULL,_timestamp TIMESTAMP NOT NULL,_lastModified
TIMESTAMPNOT NULL,name VARCHAR(255) NOT NULL,age INTEGER DEFAULT NULL,PRIMARY KEY (_id)
);
CREATE TABLE person_nationality(_id serial NOT NULL,_parent INTEGER NOT NULL,nationality VARCHAR(255) NOT NULL,FOREIGN
KEY(_parent) REFERENCES person (_id) ON DELETE CASCADE,PRIMARY KEY (_id)
);
CREATE TABLE person_variables(_id serial NOT NULL,_parent INTEGER NOT NULL,variable VARCHAR(255) DEFAULT NULL,value
VARCHAR(255)DEFAULT NULL,FOREIGN KEY (_parent) REFERENCES person (_id) ON DELETE CASCADE,PRIMARY KEY (_id)
);
I'm trying to generate XML element for each person which also contains
the person nationality and variables in one result set
SELECT
XMLROOT ( XMLELEMENT ( NAME information, XMLATTRIBUTES ( person._id AS pid ),XMLAGG( XMLELEMENT(
name "nationality", person_nationality.nationality ) ),XMLAGG( XMLELEMENT(
name "value", person_variables.value ) ) ), VERSION '1.0', STANDALONE YES
)
FROM person
INNER JOIN person_nationality ON person_nationality._parent = person._id
INNER JOIN person_variables ON person_variables._parent = person._id
GROUP BY person._id
LIMIT 100 OFFSET 10000;
The above query return number of variables * nationality for each
person which is expected (for me) because of the join logic. Also i
can't use DISTINCT keyword in XMLAGG function.
Any idea how to do this? or is there is any aggregate function returns
array from row set, i didn't find any in the documenation.
Thanks in advance
Mina.
