Require help for query

Question

hi all,
i had 3 tables
1) SERV_AUTH_DETAIL WITH COLUMNS
SERV_AUTH_DETAIL_ID
NUMBER_OF_UNITS
UNIT_COST
SERV_ID
2) PUR_ORDER_DETAIL WITH COLUMNS
PUR_ORDER_DETAIL_ID
PUR_ORDER_ID
NUMBER_OF_UNITS
UNIT_COST
SERV_AUTH_DETAIL_ID
3) PUR_ORDER WITH COLUMNS
PUR_ORDER_ID
SERV_AUTH_ID
PUR_ORDER_STATUS
when i issue the following update statement, i got the error stating
column ambiguously defined
update t_serv_auth_detail
set number_of_units = (select number_of_units
from t_pur_order_detail pod
join t_serv_auth_detail sa
on
pod.serv_auth_detail_id = sa.serv_auth_detail_id
and pod.pur_order_id = 1)
where serv_auth_detail_id = (select s.serv_auth_detail_id
from t_pur_order_detail p
join t_pur_order po
on
p.pur_order_id = po.pur_order_id
and po.pur_order_id = 1)
ERROR at line 2:
ORA-00918: column ambiguously defined
could anyone give guidelines to correct this error.
thanks in advance.
rampa

Answer 1

In your UPDATE statement:
UPDATE t_SERV_AUTH_DETAIL SA
   SET NUMBER_OF_UNITS = (SELECT NUMBER_OF_UNITS
                            FROM t_PUR_ORDER_DETAIL POD
                           WHERE POD.SERV_AUTH_DETAIL_ID = SA.SERV_AUTH_DETAIL_ID
                             AND POD.PUR_ORDER_ID = 1)
WHERE SERV_AUTH_DETAIL_ID = (SELECT P.SERV_AUTH_DETAIL_ID
                                FROM t_PUR_ORDER_DETAIL P
                                JOIN t_PUR_ORDER PO
                                  ON P.PUR_ORDER_ID = PO.PUR_ORDER_ID
                                 AND PO.PUR_ORDER_ID = 1);the 2nd subquery - SELECT P.SERV_AUTH_DETAIL_ID...
is returning more than one row and you have used a "=" operator to match it. That's the reason for that ORA error.
pratz