I would like to make a query in PostgreSQL
select
distinct on(uuid)
(select nr_zew from bo_get_sip_cti_polaczenie_info(uuid)) as nr_zew
from bo_sip_cti_event_day
where data_ins::date = current_date
and kierunek like 'P'
and (hangup_cause like 'NO_ANSWER' or hangup_cause like 'NO_USER_RESPONSE')
in Java as far I have
Result<Record> result = create
.select()
.from("bo_sip_cti_event_day")
.where("data_ins::date = current_date")
.and("kierunek like 'P'")
.and("(hangup_cause like 'NO_ANSWER' or hangup_cause like 'NO_USER_RESPONSE') ")
.fetch();
and it works but as I try to add
Result<Record> result = create
.selectDistinct("uuid")
.from("bo_sip_cti_event_day")
.where("data_ins::date = current_date")
.and("kierunek like 'P'")
.and("(hangup_cause like 'NO_ANSWER' or hangup_cause like 'NO_USER_RESPONSE') ")
.fetch();
then it says that cannot do selectDistinct(String). How can I use distinct in jOOQ?
This is definitely non-obvious to discover. There's a SelectDistinctOnStep.distinctOn() method after you've selected your actual columns. The reason why it's non-obvious to discover is that the PostgreSQL syntax itself is a bit hard to model in an internal DSL like jOOQ's.
Think of it this way: You're selecting a set of columns (the correlated subquery) while specifying on which columns a distinctness filter should be applied:
Result<Record> result = create
.select(field("(select nr_zew from bo_get_sip_cti_polaczenie_info(uuid))").as("nr_zew"))
.distinctOn(field("uuid"))
.from("bo_sip_cti_event_day")
.where("data_ins::date = current_date")
.and("kierunek like 'P'")
.and("(hangup_cause like 'NO_ANSWER' or hangup_cause like 'NO_USER_RESPONSE') ")
.fetch();
Or, if you were using the code generator:
Result<Record> result = create
.select(field(
select(BO_GET_SIP_CTI_POLACZENIE_INFO.NR_ZEW)
.from(BO_GET_SIP_CTI_POLACZENIE_INFO.call(BO_SIP_CTI_EVENT_DAY.UUID))).as("nr_zew"))
.distinctOn(BO_SIP_CTI_EVENT_DAY.UUID)
.from(BO_SIP_CTI_EVENT_DAY)
.where(BO_SIP_CTI_EVENT_DAY.cast(Date.class).eq(currentDate()))
.and(BO_SIP_CTI_EVENT_DAY.KIERUNEK.like("P"))
.and(BO_SIP_CTI_EVENT_DAY.HANGUP_CAUSE.like("NO_ANSWER")
.or(BO_SIP_CTI_EVENT_DAY.HANGUP_CAUSE.like("NO_USER_RESPONSE")))
.fetch();
Side-note on your usage of LIKE
Do note that the underscore (_) character is a single-character wild-card in SQL, so your LIKE predicates might not be entirely correct. Ideally, just use ordinary comparison predicates, such as:
kierunek = 'P'hangup_cause IN ('NO_ANSWER', 'NO_USER_RESPONSE')
You don't really seem to need LIKE.