Pipelined function with Union clause(Invalid Number(ORA-01722) error )

Question

Hi,
I have a pipelined function.
I am fetching the data with the use of a REF cursor.
The query has two part: query1 and query2
when I am opeing the cursor with query1 UNION query2,it is giving me Invalid Number(ORA-01722) error.
but when I open the cursor separately for query1 and query2,I am getting the resultset for each of the query.
query1 and query2 are running fine with UNION in the sql editor.
But,when I put them into two variables (var1 :='query1' and var2:='query2' and try to open the cursor with var1 UNION var2 , it's giving me the error.
But when I put query2 as 'Select ..... from dual' and then try to open the cursor for query1 UNION query2,
then getting the result of query1 and one extra row for query2(dual).
The FROM table set is same for query1 and query2..
can anyone please help me , why this Invalid Number(ORA-01722) error is coming.

Answer 1

query1 := 'SELECT to_char(st.store_no) STORE_NUMBER,pp.name PROGRAM_NAME, ''HBS'' DISPENSING_SYSTEM,
pt.PATIENT_SRC_NO SOURCE_ID, null RX2000_PATIENT_IDENTIFIER, pt.last_name PATIENT_LAST_NAME, pt.first_name
PATIENT_FIRST_NAME, to_char(LPAD (pppd.rx_number, 7, '' '')|| ''-''|| LPAD (pppd.refill_number, 2, 0)) RX_REFILL
FROM
pega_patient_program_dispense pppd,pega_patient_program_reg pppr,health_care_profs hcp1,
health_care_profs hcp2,prescription_dispenses pd,prescriptions p, pega_program_status_reason ppsr ,master_doctors md,
prescription_disp_orders pdo, hbs_shipment_extract hse,stores st,master_stores ms,pega_programs pp,patients pt,master_patients mpt
WHERE
pppr.referring_hcp_id=md.id(+) and md.dispensing_system_id=hcp1.hcp_id and
pppr.ID=pppd.PEGA_PATIENT_PROGRAM_REG_ID and pppd.prescription_dispense_id=pd.id and pd.prescriptions_id=p.id and
p.hcp_id=hcp2.hcp_id and ppsr.ID=pppd.PEGA_PROGRAM_STATUS_REASON_ID and pppd.prescription_dispense_id = pdo.prescriptions_dispenses_id(+) AND
pdo.shipment_number = hse.shp_no(+) and pppd.store_id=ms.id and st.id=ms.dispensing_system_id and pppr.pega_program_id=pp.id
and pppr.patient_id=mpt.id and pt.patient_id=mpt.dispensing_system_id and pppd.dispensing_system=''HBS'' and pp.name LIKE ''REV%''
AND
((pppd.prescription_dispense_id IS NOT NULL AND pppd.quantity_dispensed > 0 AND pppd.reported_date IS NULL AND
pppd.src_delete_date IS NULL AND ((pppr.program_specific_patient_code IS NULL ) OR (hcp1.last_name IS NULL) OR
(hcp1.first_name IS NULL) OR (hcp2.first_name IS NULL) OR (hcp2.last_name IS NULL) OR (hcp2.address_1 IS NULL) OR
(hcp2.city IS NULL) OR (hcp2.state_cd IS NULL) OR (hcp2.zip_1 IS NULL)OR (pppr.referral_date is NULL) OR
(hcp1.state_cd IS NULL) OR (hcp1.zip_1 IS NULL)
OR (hcp2.zip_1 IS NULL) OR (pppr.last_status_change_date IS NULL) OR (pppr.varchar_1 IS NULL) OR
(pppr.varchar_7 IS NULL OR pppr.varchar_7 LIKE ''NOT AVAILABLE AT REFERRAL%'') OR (pppr.varchar_5 IS NULL OR
pppr.varchar_5 LIKE ''NOT AVAILABLE AT REFERRAL%'')) ) AND ppsr.INCLUDE_ON_EXCEPTION_RPT_IND=''Y'')
OR
((pppd.authorization_number IS NULL OR NVL(TRUNC(pdo.shipped_date),TRUNC(hse.shp_act_date_dt)) NOT BETWEEN
TRUNC(pppd.date_1) AND TRUNC(pppd.date_2)) OR (pppd.varchar_4 IS NULL OR NVL(TRUNC(pdo.shipped_date),
TRUNC(hse.shp_act_date_dt)) NOT BETWEEN TRUNC(pppd.date_3) AND TRUNC(pppd.date_5)))
OR
(pppr.pega_program_competitors_id IS NULL AND (ppsr.manufacturer_status=''TRIAGE'' AND ppsr.manufacturer_reason=''COMPETITOR''))
OR
(ppsr.manufacturer_reason IS NULL)
query2 := ' SELECT ''150'' STORE_NUMBER,''test'' PROGRAM_NAME , ''RX2000'' DISPENSING_SYSTEM
,''01'' SOURCE_ID, null RX2000_PATIENT_IDENTIFIER, ''test'' PATIENT_LAST_NAME, ''test'' PATIENT_FIRST_NAME,
''rx01'' RX_REFILL
FROM
pega_patient_program_reg pppr,health_care_profs hcp1, pega_program_status_reason ppsr ,
master_doctors md,stores st,master_stores ms,pega_programs pp,patients pt,master_patients mpt
WHERE
pppr.referring_hcp_id=md.id(+) and md.dispensing_system_id=hcp1.hcp_id and
ppsr.ID=pppr.REFERRAL_STATUS_ID and st.store_type=''M'' and pppr.store_id=ms.id and st.id=ms.dispensing_system_id
and pppr.pega_program_id=pp.id and pppr.patient_id=mpt.id and pt.patient_id=mpt.dispensing_system_id and pp.name LIKE ''REV%''
AND
((((pppr.program_specific_patient_code IS NULL ) OR (hcp1.last_name IS NULL) OR (hcp1.first_name IS NULL) OR
(pppr.referral_date is NULL) OR (hcp1.state_cd IS NULL) OR (hcp1.zip_1 IS NULL) OR (pppr.last_status_change_date IS NULL)
OR (pppr.varchar_1 IS NULL) OR (pppr.varchar_7 IS NULL) OR (pppr.varchar_5 IS NULL OR pppr.varchar_5 LIKE
''NOT AVAILABLE AT REFERRAL%'')) ) AND ppsr.INCLUDE_ON_EXCEPTION_RPT_IND=''Y'')
OR
(pppr.pega_program_competitors_id IS NULL AND (ppsr.manufacturer_status=''TRIAGE'' AND ppsr.manufacturer_reason=''COMPETITOR''))
OR
(ppsr.manufacturer_reason IS NULL)
AND
pppr.id NOT IN(select pppd.PEGA_PATIENT_PROGRAM_REG_ID from PEGA_PATIENT_PROGRAM_DISPENSE pppd)';
BUT IF I put
query2 := ' SELECT ''150'' STORE_NUMBER,''test'' PROGRAM_NAME , ''RX2000'' DISPENSING_SYSTEM
,''01'' SOURCE_ID, null RX2000_PATIENT_IDENTIFIER, ''test'' PATIENT_LAST_NAME, ''test'' PATIENT_FIRST_NAME,
''rx01'' RX_REFILL
FROM DUAL';
then it is giving result.