db2 case when subselect - db2

Question

I have the following SQL query on IBM DB2.
SUM(CASE
WHEN verzijaplaca.vpl_vrsteplacila = 9150 THEN
(select sum(verplaca.vpl_bruto)
from pet320.verzijaplaca as verplaca
)
ELSE 0
END) AS "brutoplacazaure"
The inner select works, but when I include it in CASE when it reports error.
ERROR: An operand of a column function is invalid.
DB2 SQL Error:
SQLCODE=-112, SQLSTATE=42607, SQLERRMC=null, DRIVER=3.57.91
Error
Code: -112
Also If I run only
SUM(CASE
WHEN verzijaplaca.vpl_vrsteplacila = 9150 THEN
(1.0)
ELSE 0
END) AS "brutoplacazaure"
it works
Any suggestions?? It seems that DB 2 doesn't support the inner sql in case when case or smth like that
Thank you
the whole sql query is the following
SELECT
zaposleni.za_koda AS "za_koda",
MAX(enotezpiz.ezp_rsza) AS "ezp_rsza",
MAX(zaposleni.za_polnoime) AS "za_polnoime",
MAX(verzije.ve_datnamena) AS "ve_datnamena",
MAX(verzije.ve_datizp) AS "ve_datizp",
MAX(opp_telefonodgos) AS "opp_telefonodgos",
MAX(pod_krajzaizpise ||', ') AS "pod_krajzaizpise",
MAX(racuni.ra_stracuna) AS "ra_stracuna",
MAX(racuni.ra_modul) AS "ra_modul",
MAX(racuni.ra_sklstev) AS "ra_sklstev",
MAX(verzije.ve_datizp) AS "ve_datizp",
MAX(verzije.ve_naziv) AS "ve_naziv",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl in (1,2,3,4,16) and vrsteplacila.vp_udodatkov = 0 THEN verzijaplaca.vpl_eure
ELSE 0
END) AS "mfure",
MAX(dmzaposlenih.dmz_enotezpiz) AS "dmz_enotezpiz",
(select
SUM(olajsave.ozz_znesekolajsave) / 12
from
pet320.olajsavedczaposlenih as olajsave
INNER JOIN
pet320.verzije as verzija1
ON
olajsave.ooz_datumod <= verzija1.ve_datkm AND (olajsave.ooz_datumdo IS NULL OR olajsave.ooz_datumdo >= verzija1.ve_datzm)
INNER JOIN
pet320.zaposleni as zapp
ON
olajsave.ozz_zaposleni = zapp.za_id_za
INNER JOIN
pet320.VERZIJAPLACA as vpl
ON
vpl.vpl_verzije = verzija1.ve_id_ve
AND zapp.za_id_za = vpl.vpl_zaposleni
where
1=1
AND (vpl.vpl_vrsteplacila = 9150 OR vpl.vpl_skupinevrpl = 6)) AS "vz_znesvzddc",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl = 3 AND vrsteplacila.vp_udodatkov = 0 THEN verzijaplaca.vpl_eure
WHEN vrsteplacila.vp_skupinevrpl = 4 AND vrsteplacila.vp_udodatkov = 1 THEN verzijaplaca.vpl_eure
ELSE
0
END) AS "bolovalure",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl = 4 AND vrsteplacila.vp_udodatkov = 0 THEN verzijaplaca.vpl_eure
ELSE
0
END) AS "izostanekzdelaure",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl = 3 THEN verzijaplaca.vpl_bruto
ELSE
0
END) AS "brutoznesekboleznine",
SUM(CASE WHEN vrsteplacila.vp_skupinevrpl = 16 THEN verzijaplaca.vpl_bruto
ELSE
0
END) AS "brutodopolnega",
SUM(CASE WHEN vrsteplacila.vp_skupinevrpl = 16 and vrsteplacila.vp_udodatkov = 0 THEN verzijaplaca.vpl_eure
ELSE
0
END) AS "uredopolenga",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl IN (16) THEN (verzijaplaca.vpl_bruto - verzijaplaca.vpl_neto)
ELSE
0
END) AS "prispevkizasocvarnost",
SUM(CASE
WHEN vrsteplacila.vp_skupinevrpl IN (16) THEN verzijaplaca.vpl_akdohod
ELSE
0
END) AS "akdohodnine",
SUM(CASE
WHEN verzijaplaca.vpl_skupinevrpl IN (16) THEN verzijaplaca.vpl_neto - verzijaplaca.vpl_akdohod
ELSE
0
END) AS "netonadomestilo",
SUM(CASE WHEN verzijaplaca.vpl_vrsteplacila = 9150 THEN
(select sum(verplaca.vpl_bruto)
from pet320.verzijaplaca as verplaca
INNER JOIN
pet320.verzije as ver
ON
ver.ve_id_ve = verplaca.vpl_verzije
INNER JOIN
pet320.zaposleni as zapo
ON
zapo.za_id_za = verplaca.vpl_zaposleni
AND ver.ve_id_ve = verplaca.vpl_verzije
where verplaca.vpl_vrsteplacila in (select vp_id_vp from pet320.vrsteplacila where vp_skupinevrpl in (1,2))
and verplaca.vpl_zaposleni = zapo.za_id_za
and verplaca.vpl_verzije = ver.ve_id_ve)
ELSE 0
END) AS "brutoplacazaure"
FROM
pet320.verzijaplaca AS verzijaplaca
INNER JOIN
pet320.vrsteplacila AS vrsteplacila
ON
verzijaplaca.vpl_vrsteplacila = vrsteplacila.vp_id_vp
INNER JOIN
pet320.verzije AS verzije
ON
verzijaplaca.vpl_verzije = verzije.ve_id_ve
INNER JOIN
pet320.zaposleni AS zaposleni
ON
verzijaplaca.vpl_zaposleni = zaposleni.za_id_za
INNER JOIN
(SELECT
a.*
FROM
pet320.dmzaposlenih AS a
INNER JOIN
(SELECT
dmz_zaposleni,
MAX(dmz_datumod) AS max_dmz_datumod
FROM
pet320.dmzaposlenih
GROUP BY
dmz_zaposleni) AS b
ON
a.dmz_zaposleni = b.dmz_zaposleni
AND a.dmz_datumod = b.max_dmz_datumod) as dmzaposlenih
ON
dmzaposlenih.dmz_zaposleni = verzijaplaca.vpl_zaposleni
INNER JOIN
pet320.enotezpiz AS enotezpiz
ON
dmzaposlenih.dmz_enotezpiz = enotezpiz.ezp_id_ezp
LEFT JOIN
pet320.osnovnipodplace AS osnovnipodplace
ON
1=1
INNER JOIN
pet320.racuni AS racuni
ON
osnovnipodplace.opp_racuni = racuni.ra_id_ra
INNER JOIN
pet320.podjetja AS podjetja
ON
osnovnipodplace.opp_podjetja = podjetja.pod_id_pod
LEFT JOIN
pet320.verzijazaposleni AS verzijazaposleni
ON
verzijazaposleni.vz_zaposleni = zaposleni.za_id_za
AND verzijazaposleni.vz_verzije = verzije.ve_id_ve
INNER JOIN
pet320.verzijastrmesta as verzijastrmesta
ON
verzijastrmesta.vs_verzije = verzije.ve_id_ve
AND verzijastrmesta.vs_strmesta = dmzaposlenih.dmz_strmesta
INNER JOIN
pet320.verzijaorgenote AS verzijaorgenote
ON
verzijaorgenote.vo_verzije = verzije.ve_id_ve
AND verzijaorgenote.vo_orgenote = dmzaposlenih.dmz_orgenote
INNER JOIN
pet320.zaposinvalidi AS zaposinvalidi
ON
zaposinvalidi.zi_zaposleni = verzijaplaca.vpl_zaposleni and zi_datdo is null
INNER JOIN
pet320.verzijasumstavki AS verzijasumstavki
ON
verzijasumstavki.vss_verzije = verzijaplaca.vpl_verzije AND
verzijasumstavki.vss_zaposleni = verzijaplaca.vpl_zaposleni AND
verzijasumstavki.vss_vrsteplacila = 9301
WHERE
1=1
AND vrsteplacila.vp_skupinevrpl in (1,2,3,4,16)
AND (verzijaplaca.vpl_verzije = 215)
AND (verzijaplaca.vpl_zaposleni IS NULL OR 1=1)
AND (verzijaplaca.vpl_strm_strmesta IS NULL OR 1=1)
AND (dmzaposlenih.dmz_orgenote IS NULL OR 1=1)
AND (dmzaposlenih.dmz_izplacilnamesta IS NULL OR 1=1)
AND (verzijaplaca.vpl_placilnirazredi IS NULL OR 1=1)
AND (dmzaposlenih.dmz_vrstapog IN (1,0))
AND verzijaplaca.vpl_zaposleni in (select distinct vpl_zaposleni from pet320.verzijaplaca where vpl_skupinevrpl = 16 AND vpl_verzije = 215)
group by dmzaposlenih.dmz_enotezpiz,
zaposleni.za_koda
ORDER BY
dmzaposlenih.dmz_enotezpiz,
zaposleni.za_koda
INNER JOIN
(SELECT
a.*
FROM
pet320.dmzaposlenih AS a
INNER JOIN
(SELECT
dmz_zaposleni,
MAX(dmz_datumod) AS max_dmz_datumod
FROM
pet320.dmzaposlenih
GROUP BY
dmz_zaposleni) AS b
ON
a.dmz_zaposleni = b.dmz_zaposleni
AND a.dmz_datumod = b.max_dmz_datumod) as dmzaposlenih
ON
dmzaposlenih.dmz_zaposleni = verzijaplaca.vpl_zaposleni
INNER JOIN
pet320.enotezpiz AS enotezpiz
ON
dmzaposlenih.dmz_enotezpiz = enotezpiz.ezp_id_ezp
LEFT JOIN
pet320.osnovnipodplace AS osnovnipodplace
ON
1=1
INNER JOIN
pet320.racuni AS racuni
ON
osnovnipodplace.opp_racuni = racuni.ra_id_ra
INNER JOIN
pet320.podjetja AS podjetja
ON
osnovnipodplace.opp_podjetja = podjetja.pod_id_pod
LEFT JOIN
pet320.verzijazaposleni AS verzijazaposleni
ON
verzijazaposleni.vz_zaposleni = zaposleni.za_id_za
AND verzijazaposleni.vz_verzije = verzije.ve_id_ve
INNER JOIN
pet320.verzijastrmesta as verzijastrmesta
ON
verzijastrmesta.vs_verzije = verzije.ve_id_ve
AND verzijastrmesta.vs_strmesta = dmzaposlenih.dmz_strmesta
INNER JOIN
pet320.verzijaorgenote AS verzijaorgenote
ON
verzijaorgenote.vo_verzije = verzije.ve_id_ve
AND verzijaorgenote.vo_orgenote = dmzaposlenih.dmz_orgenote
INNER JOIN
pet320.zaposinvalidi AS zaposinvalidi
ON
zaposinvalidi.zi_zaposleni = verzijaplaca.vpl_zaposleni and zi_datdo is null
INNER JOIN
pet320.verzijasumstavki AS verzijasumstavki
ON
verzijasumstavki.vss_verzije = verzijaplaca.vpl_verzije AND
verzijasumstavki.vss_zaposleni = verzijaplaca.vpl_zaposleni AND
verzijasumstavki.vss_vrsteplacila = 9301
WHERE
1=1
AND vrsteplacila.vp_skupinevrpl in (1,2,3,4,16)
AND (verzijaplaca.vpl_verzije = 215)
AND (verzijaplaca.vpl_zaposleni IS NULL OR 1=1)
AND (verzijaplaca.vpl_strm_strmesta IS NULL OR 1=1)
AND (dmzaposlenih.dmz_orgenote IS NULL OR 1=1)
AND (dmzaposlenih.dmz_izplacilnamesta IS NULL OR 1=1)
AND (verzijaplaca.vpl_placilnirazredi IS NULL OR 1=1)
AND (dmzaposlenih.dmz_vrstapog IN (1,0))
AND verzijaplaca.vpl_zaposleni in (select distinct vpl_zaposleni from pet320.verzijaplaca where vpl_skupinevrpl = 16 AND vpl_verzije = 215)
group by dmzaposlenih.dmz_enotezpiz,
zaposleni.za_koda
ORDER BY
dmzaposlenih.dmz_enotezpiz,
zaposleni.za_koda

Answer 1

The query as you tried to write it would run
select sum(verplaca.vpl_bruto)
from pet320.verzijaplaca as verplaca
and produce the exact same result every time the case statement was true. Even if you can do it that way, you shouldn't, because it's a huge waste of time to run that query over and over. Instead, run that statement once and store the value. Then refer to the stored value whenever you need it. Here are a couple of options:
with vpl_bruto_sum as (
select sum(verplaca.vpl_bruto) as total
from pet320.verzijaplaca as verplaca
)
select sum(case when verzijaplaca.vpl_vrsteplacila = 9150
then vpl_bruto_sum.total else 0
end
)
from pet320.verzijaplaca
inner join vpl_bruto_sum on 1=1;
Or you could make thinks simpler by using the join condition instead of the inner case statement:
with vpl_bruto_sum as (
select sum(verplaca.vpl_bruto) as total
from pet320.verzijaplaca as verplaca
)
select sum(vpl_bruto_sum.total)
from pet320.verzijaplaca
left outer join vpl_bruto_sum on verzijaplaca.vpl_vrsteplacila = 9150;
If you want to calculate a value, then use it in multiple different queries, you could use a variable:
create or replace variable my_sum integer;
set my_sum = (select sum(vpl_bruto) from pet320.verzijaplaca);
select sum(case when verzijaplaca.vpl_vrsteplacila = 9150
then my_sum else 0
end
)
from pet320.verzijaplaca;
Hopefully that will help you get started.
It looks like there are probably other problems with your query as well. For example, where 1=1 and... is not a useful construct. It might be worth seeking help about how to design a better query--I think it could be a lot simpler, though it's hard to say without knowing what you are doing.