Order by is normally set from outside the UDTF.
If you really want to add a variable order by you may use a case clause:
Return (Select ....
Order By Case When Par1 = 1 and Par2 = 'ASC' Then Col1 End,
Case When Par1 = 1 and Par2 = 'DESC' then Col1 End Desc,
Case When Par1 = 2 and Par2 = 'ASC' Then Col2 End,
Case When Par1 = 2 and Par2 = 'DESC' Then Col2 End Desc)
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
?Train people well enough so they can leave, treat them well enough so they
don't want to.? (Richard Branson)
-----Ursprüngliche Nachricht-----
Von: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Arco
Simonse
Gesendet: Tuesday, 27.12 2016 17:09
An: Midrange Systems Technical Discussion
Betreff: Flexible ORDER BY based on parameter in UDTF
Hi,
Is it possible use a variable or parameter value for setting an ORDER BY in
a UDTF?
I want to do something like the code below but having a hard time to achieve
this. IS it even doable?
Thanks,
-Arco
CREATE OR REPLACE FUNCTION
Test_Udtf_01
(
peOrderBy01 INTEGER,
peOrderDir01 CHAR(10)
)
RETURNS TABLE (
var INTEGER,
str CHAR(20)
)
LANGUAGE SQL
READS SQL DATA
NO EXTERNAL ACTION
NOT DETERMINISTIC
DISALLOW PARALLEL
RETURN
(
SELECT * FROM LATERAL(VALUES
(1, 'Hello'), (3, 'Is'), (6, 'But'), (7, 'Nothing'),
(2, 'Everything'), (4, 'Just'), (5, 'Fine'), (8, 'Happens'))
AS TestTable(val, str)
ORDER BY peOrderBy01
) ;
SELECT * FROM TABLE
( Test_Udtf_01(
CAST(1 AS INTEGER), -- order by this column
CAST('ASC' AS CHAR(10)) -- order direction
)
) AS t ;
Executing this UDTF runs into errors:
CPF9898 UDF inlining error.
CPF4204 Internal failure occurred in query processor.
SQL0901 SQL system error.
Trying a variety of CASE statements in the ORDER BY clause, then it does
execute without error but does not order:
..repeated code..
ORDER BY CASE WHEN COALESCE(peOrderBy01, 0) <> 0 THEN peOrderBy01 ELSE
peOrderBy01 END
..repeated code..
ORDER BY CASE WHEN COALESCE(peOrderBy01, 1) = 1 THEN 1 ELSE 2 END
..repeated code..
ORDER BY (CAST(peOrderBy01 AS INTEGER))
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