Populatie IN list with a subquery - tsql

Question

Preamble:
I'm working in an environment (Knowage) that let me only do SELECTs.
$P{something} is the call of a parameter replaced by knowage when running the query on the MSSQL engine
Whay I have to do:
I have to use a parameter to 'filter' the data with an entry that let take out all, currently I can only get filtered data, i cannot take out 'all'
My query looks like this:
select ClusterDRG, t.N as N_cur, u.N as N_pas, t.SubStabilimento
from(
--- prendo i primi 10 DRG del periodo in corso confrontando i valori degli stessi DRG del periodo precedente (indipendentemente dal fatto che fossero o meno tra i primi 10)
SELECT count(ProgrSdo) as N
,ClusterDRG, TipologiaDRG as tipodrg
, ROW_NUMBER() OVER(PARTITION BY anno,tipologiaDRG ORDER BY count(progrsdo) desC) as Ordine
, case when [Anno]=$P{lista_anni} then 'Attuale'
when [Anno]=$P{lista_anni}-1 then 'Precedente'
else cast([Anno] as varchar (4)) end as Anno
FROM
MY_TABLE
where left(Mese,2) <=$P{lista_mesi}
and ANNO = $P{lista_anni} -- l'anno corrente
and SubStabilimento = $P{lista_stabilimenti} -- here is my issue
and codicepresidio=111111
group by ClusterDRG, TipologiaDRG, anno, SubStabilimento
) t
left join
(
SELECT count(ProgrSdo) as N
,ClusterDRG, TipologiaDRG as tipodrg
, case when [Anno]=$P{lista_anni} then 'Attuale'
when [Anno]=$P{lista_anni}-1 then 'Precedente'
else cast([Anno] as varchar (4)) end as Anno
, ROW_NUMBER() OVER(PARTITION BY anno,tipologiaDRG ORDER BY count(progrsdo) desC) as Ordine
FROM MY_TABLE
where left(Mese,2) <= $P{lista_mesi}
and ANNO = $P{lista_anni}-1 -- l'anno passato
and codicepresidio=111111
and SubStabilimento = $P{lista_stabilimenti} -- here is my issue
group by ClusterDRG, TipologiaDRG, anno, SubStabilimento
)u on t.ClusterDRG=u.ClusterDRG and t.TipoDRG=u.TipoDRG and t.SubStabilimento=u.SubStabilimento
my parameters got these values:
$P{lista_mesi} := 5
$P{lista_anni} := 2018
$P{lista_stabilimenti} := **here is my issue**
I want to use $P{lista_stabilimenti} to filter by single entity (and at doing that now it works) or all if a specific value is set.
so If I have $P{lista_stabilimenti} := 'stab1'
I get
clust1, 123, 122, stab1
clust2, 789, 456, stab1
and If I have $P{lista_stabilimenti} := 'ALL' (This is the behaviour I'm trying to make)
I get
clust1, 123, 122, stab1
clust2, 789, 456, stab1
clust1, 321, 221, stab2
clust2, 987, 654, stab2
clust5, 963, 258, stab3
I tryed populating the and SubStabilimento = $P{lista_stabilimenti}
as
[...]
and SubStabilimento in ( case when exists ( select SubStabilimento from Knowage_L15_COLLEGATA where SubStabilimento = $P{lista_stabilimenti}) then $P{lista_stabilimenti}
when $P{lista_stabilimenti} like 'TUTTI' then (
select STUFF(
(
SELECT ',' + SubStabilimento
FROM MY_TABLE v
where CodicePresidio = '111111'
group by SubStabilimento
FOR XML PATH('')
),
1, 1, '')
)
end)
[...]
With this I get a string like stab1,stab2,stab3 but I'm not able to feed it to the IN clause

Answer 1

A pizza made my brain to grind again, my solution is like this:
[...]
and SubStabilimento LIKE ( select case when exists (
select SubStabilimento
from MY_TABLE
where SubStabilimento = $P{lista_stabilimenti})
then $P{lista_stabilimenti}
when $P{lista_stabilimenti} like 'TUTTI'
then '%' end as SubStab )
[...]