This is how I solved it:
SELECT
xmlagg(
xmlconcat(
xmlelement(name test_element,
xmlforest(
ff.d AS a
)--xmlforest
)
)--xmlconcat
)--xmlagg
FROM (
SELECT
--xmlagg(
xmlconcat(
xmlelement(name test_element,
xmlattributes(
0 AS m
),
xmlforest(
dh.id AS i
,dh.some_value AS sv
)--xmlforest
)--test_element
) AS d
--)
FROM __pg_test_table AS dh
WHERE dh.__rel=5 LIMIT 2 --OFFSET 10;
) AS ff;
2013/11/26 Albe Laurenz <laurenz.albe@xxxxxxxxxx>
Peter Kroon wrote:> SELECT
> Is anyone able to reproduce?
> When I run the query below all 5 rows are returned instead of 2.
> Or is this the default behaviour..
> xmlagg(
[...]
> )--xmlaggAccording to the documentation, that query should return
> FROM __pg_test_table AS dh
> WHERE dh.__rel=5 LIMIT 2 --OFFSET 10;
exactly one row since xmlagg is an aggregate.
So the LIMIT 2 won't do anything to the result.
You can wrap your query in a
SELECT count(*) FROM (SELECT ...) AS dummy;
to see how many rows you got.
Yours,
Laurenz Albe
