But the same query with a parameter returns an error:
select id, usr, code, line1, line2 from tbl, get_lines(code); --> ERROR: function expression in FROM may not refer to other relations
of same query level
This is as expected and required -- you cannot refer to other FROM clause relations. I believe SQL99 defines a clause (LATERAL IIRC) that would allow this, but it hasn't been implemented yet.
Is there another way to run this query and get:
id usr code line1 line2 ---------------------------------- 1 one 1 A B 2 two 2 Z Z 3 three 1 A B
Whats wrong with just using CASE:
select id, usr, code,
case when code = 1 then 'A' else 'Z' end as line1,
case when code = 1 then 'A' else 'Z' end as line2
from tbl;
id | usr | code | line1 | line2
----+-------+------+-------+-------
1 | one | 1 | A | A
2 | two | 2 | Z | Z
3 | three | 1 | A | A
(3 rows)Joe
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