SQL> select * from acctinactprocess;

                                ACCTNBR                                MEDIUMID
--------------------------------------- ---------------------------------------
                                      3                                       8
                                      4                                       9
                                      1                                       1
                                      2                                       2

SQL> select * from mediumpag;

                               MEDIUMID VOUHTYPE
--------------------------------------- ----------
                                      1 vche
                                      2 vcne
                                      3 vtx
                                      4 vcne

SQL>
SQL> select ai.acctnbr,ai.mediumid,md.vouhtype from acctinactprocess ai,mediumpag md where ai.mediumid=md.mediumid(+) and md.vouhtype(+) in('vche','vcne');

select ai.acctnbr,ai.mediumid,md.vouhtype from acctinactprocess ai,mediumpag md where ai.mediumid=md.mediumid(+) and md.vouhtype(+) in('vche','vcne')

ORA-01719: OR 或 IN 操作数中不允许外部联接运算符 (+)

SQL> select ai.acctnbr,ai.mediumid,md.vouhtype from acctinactprocess ai,mediumpag md where ai.mediumid=md.mediumid(+) and md.vouhtype(+)='vche'
  2  union
  3  select ai.acctnbr,ai.mediumid,md.vouhtype from acctinactprocess ai,mediumpag md where ai.mediumid=md.mediumid(+) and md.vouhtype(+)='vcne';

   ACCTNBR   MEDIUMID VOUHTYPE
---------- ---------- ----------
         1          1 vche
         1          1
         2          2 vcne
         2          2
         3          8
         4          9

6 rows selected