HI!
Consider the following server side function:
CREATE FUNCTION my_function(int4) RETURNS SETOF int8 AS
$BODY$
SELECT
CASE WHEN (some_condition)
THEN (
SELECT ... -- arbitrary select (returning row(s) of int8 values)
)
ELSE (
SELECT ... -- arbitrary select (returning row(s) of int8 values)
)
END
$BODY$
LANGUAGE 'sql' VOLATILE;
This function works fine if one of the two inner SELECT statements returns
exactly one result (one row), but fails whenever one of them returns more
than one result / rows.
What is the reason? I mean the function is declared as returning "SETOF int8",
so why does it expect a scalar?
CU
Christian
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