Converting an PLSQL select statement into a update - plsql

Question

Guys I have such a problem.
I know how to write a good select statement but I have no idea how to turn it into a corresponding update.
Im still learning plsql
Here is my select
select * --count(*)
from POLISY_OT ot
join polisy p on p.poli_id = ot.ot_poli_id
join sou.rai_skl rs on rs.ot_id = ot.ot_id
where ot_under_promil = 0
and ot_skladka_rok <> ot_skladka_netto_rok
and ot_rodzaj_um = 'OP'
and ot_rodzaj = 'D'
and ot_produkt_id = 17
and p.poli_status in ('AK', 'CZ')
and rs.skl_roczna = ot.ot_skladka_rok;
now I would like to wrap it up with an update and create something like this
update (
select * --count(*)
from POLISY_OT ot
join polisy p on p.poli_id = ot.ot_poli_id
join sou.rai_skl rs on rs.ot_id = ot.ot_id
where ot_under_promil = 0
and ot_skladka_rok <> ot_skladka_netto_rok
and ot_rodzaj_um = 'OP'
and ot_rodzaj = 'D'
and ot_produkt_id = 17
and p.poli_status in ('AK', 'CZ')
and rs.skl_roczna = ot.ot_skladka_rok)
set ot_skladka_rok = ot_skladka_netto_rok;

Answer 1

First, I really hope you aren't a student asking for homework help. That really bugs me.
On the assumption it's not, it's a little hard to tell exactly which columns belong to which tables, given that you didn't include the table aliases throughout.
I read this as that you wanted to update a column based on the value in another table, restricting the table updates to records that match a third table).
So I think you want something like this:
UPDATE polisy_ot ot
SET ot_skladka_rok =
(SELECT ot_skladka_netto_rok
FROM sou.rai_skl rs
WHERE rs.ot_id = ot.ot_id
AND rs.skl_roczna = ot.ot_skladka_rok)
WHERE ot_under_promil = 0
AND ot_skladka_rok <> ot_skladka_netto_rok
AND ot_rodzaj_um = 'OP'
AND ot_rodzaj = 'D'
AND ot_produkt_id = 17
AND EXISTS (SELECT NULL
FROM polisy p
WHERE p.poli_id = ot.ot_poli_id
AND p.poli_status IN ('AK', 'CZ'))
Good luck,
Stew