I want to combine two column in one column in oracle. I have follow this link: this . The query is:
SELECT T6.ITEM_GROUP_NAME,T7.ZONE_NAME,T5.SR_NAME, T5.SR_ID, T5.MOBILE_NO ,T3.ROUTE_NAME ,T1.OUTLET_NAME, T1.OUTLET_ADDRESS, T1.PROPRITOR_NAME, T1.MOBILE_NUMBER , T2.STATUS || T8.REASON as OUTLET_STATUS,
SUM(((T2.ITEM_CTN*T4.FACTOR)+ T2.ITEM_QTY )*T2.OUT_PRICE )AS AMOUNT
FROM T_OUTLET T1 , T_ORDER_DETAIL T2, T_ROUTE T3 , T_ITEM T4 , T_SR_INFO T5 , T_ITEM_GROUP T6 ,T_ZONE T7 , T_NON_PRODUCTIVE_SALES T8
WHERE T6.ITEM_GROUP_ID='000200000' and T7.ZONE_ID='Z002' and T5.SR_ID= '174369' and T2.OUTLET_ID=T1.OUTLET_ID AND T3.ROUTE_ID = T2.ROUTE_ID AND T2.STATUS='Y' and T2.ENTRY_DATE= TO_DATE( '11/02/2017','dd/mm/yyyy') and T2.ITEM_ID=T4.ITEM_ID and T8.ENTRY_DATE= TO_DATE( '11/02/2017','dd/mm/yyyy') and T8.SR_ID = '174369' and T2.OUTLET_ID= T8.OUTLET_ID
GROUP BY T6.ITEM_GROUP_NAME,T7.ZONE_NAME,T5.SR_NAME, T5.SR_ID, T5.MOBILE_NO ,T2.ENTRY_DATE , T2.OUTLET_ID,T3.ROUTE_NAME ,T1.OUTLET_NAME, T1.OUTLET_ADDRESS, T1.PROPRITOR_NAME, T1.MOBILE_NUMBER , OUTLET_STATUS
ORDER BY T1.OUTLET_NAME
But when I do this, it shows error:
ORA-00904: "OUTLET_STATUS": invalid identifier
Where is the problem?