Inserting parameters to SQL query in Oracle SQL - sql

Question

In the following query between date time columns are repeated in multiple places and I need to replace them with two variables named start_date and end_date I tried multiple methods and had no luck. Please answer with a runnable query if you can. Thanks in advance.
WITH encounter
AS (SELECT patient_pomr_id AS encounter_number,
patient_id AS umrn,
doctor_id,
doctor_name
FROM eh_pomr.ehpom_patient_pomr
WHERE created_on BETWEEN timestamp '2022-08-01 00:00:00' AND
timestamp '2022-08-30 00:00:00'),
chief_complain
AS (SELECT chief_complain,
patient_pomr_id
FROM eh_pomr.ehpom_chief_complain),
admission
AS (SELECT admitted_date,
patient_id,
ADMISSION_ID,
admission_type AS encounter_type,
patient_pomr_id,
hospital_id,
clinic_name
FROM ad_request.admlm_admission
WHERE direct_admission IS NULL
AND is_from_er != 1
AND created_date BETWEEN timestamp '2022-08-01 00:00:00' AND
timestamp '2022-08-30 00:00:00'),
ip_create_admission
AS (SELECT patientpomr,
dbms_lob.Substr(admitting_diagnosis, 2000, 1) diagnosis
FROM eh_ip.ehip_create_admission
WHERE created_on BETWEEN timestamp '2022-08-01 00:00:00' AND
timestamp '2022-08-30 00:00:00'),
discharge
AS (SELECT CASE
WHEN dischargevia = 1 THEN 'Private Vehicle'
WHEN dischargevia = 2 THEN 'Ambulatory'
WHEN dischargevia = 3 THEN 'Other'
ELSE ' Unknown'
END AS dischargevia,
pomrid,
modifiedon AS discharge_date,
conditionondischarge AS discharge_speciality
FROM eh_ndischarge.ehipd_dischargedetails
WHERE isactive = 1),
death
AS (SELECT dbms_lob.Substr(underlying_cause, 2000, 1) cause_of_death,
patientpomr
FROM eh_ip.ehip_death_detail),
empi
AS (SELECT id_number,
mrn
FROM rf_empi.emred_patients),
vitals
AS (SELECT PR.id,
PR.patient_pomr_id,
FS.field_code,
FS.value
FROM eh_commmon.ehcom_patient_record PR
left join eh_commmon.ehcom_flow_sheet_data FS
ON PR.id = FS.patient_record_id
WHERE PR.flow_sheet_code = 'vitals'
AND FS.time_stamp BETWEEN timestamp '2022-08-01 00:00:00' AND
timestamp '2022-08-30 00:00:00'),
leaves
AS (SELECT requesting_days,
visit_id,
ADM.PATIENT_POMR_ID
FROM ad_request.admlm_med_leave_final_print FP
left join ad_request.admlm_medical_leave ML
ON FP.request_id = ML.request_id
LEFT JOIN AD_REQUEST.ADMLM_ADMISSION ADM
ON ML.VISIT_ID = ADM.ADMISSION_ID
WHERE FP.leave_status = 5
AND ML.created_date BETWEEN timestamp '2022-08-01 00:00:00' AND
timestamp '2022-08-30 00:00:00'
AND ML.REQUESTING_DAYS IS NOT NULL)
SELECT DISTINCT encounter.encounter_number,
admission.encounter_type,
empi.id_number AS Patient_National_ID,
admission.patient_id AS umrn,
admission.admitted_date,
admission.hospital_id,
admission.clinic_name AS admission_speciality,
chief_complain.chief_complain,
leaves.requesting_days AS Duration_of_leave,
encounter.doctor_id,
encounter.doctor_name,
ip_create_admission.diagnosis,
discharge.dischargevia,
discharge.discharge_date,
discharge_speciality,
admission.clinic_name AS clinic,
death.cause_of_death
-- VITALS.field_code,
-- VITALS.value
FROM admission
left join empi
ON admission.patient_id = empi.mrn
left join encounter
ON admission.patient_pomr_id = encounter.encounter_number
left join ip_create_admission
ON admission.patient_pomr_id = ip_create_admission.patientpomr
--admission_request_numbrer with adt
left join discharge
ON admission.patient_pomr_id = discharge.pomrid
left join death
ON admission.patient_pomr_id = death.patientpomr
left join chief_complain
ON admission.patient_pomr_id = chief_complain.patient_pomr_id
left join leaves
ON admission.patient_pomr_id = leaves.PATIENT_POMR_ID
I tried adding with begin and end tags with declare key words but had no luck. Also is there a special way to insert variable using in to keyword when we need to insert it for between?

Answer 1

Include yet another CTE (I'm calling it dates) which is then cross-joined in another CTEs which utilize these values. Something like this:
WITH
dates (start_date, end_date) --> this is new CTE
AS (SELECT timestamp '2022-08-01 00:00:00',
timestamp '2022-08-30 00:00:00'
FROM dual),
encounter
AS (SELECT patient_pomr_id AS encounter_number,
patient_id AS umrn,
doctor_id,
doctor_name
FROM eh_pomr.ehpom_patient_pomr
CROSS JOIN dates d --> it is used here
WHERE created_on BETWEEN d.start_date AND d.end_date), --> like this
chief_complain
AS ..

Answer 2

This is from MSSQL, you can try converting this through OracleSQL
#dateFrom datetime = null,
#dateTo datetime = null,
DATEADD(D, 0, DATEDIFF(D, 0, #DateFrom))
AND DATEADD(D, 0, DATEDIFF(D, 0, #DateTo))