UNION for Columns of CLOB data type does not work

Hi,
I have two tables Encounter & Encounter_History. They have same columns. One column is of type CLOB. My requirement is to retrieve all the distinct records from both the tables with order by a date column. But problem is, UNION does not work in case of CLOB data type.
I know it will work if I use UNION ALL, but it returns duplicate records.
Please give me suggestion, how to solve this problem.
For example: The following query does not work since column1 is a CLOB data type
select column1 from table1
union
select column1 from table2
Thanks

But for sufficiently small clobs you can try:
michaels> SELECT TO_CLOB ('abc') cl
FROM DUAL
UNION
SELECT TO_CLOB ('abc')
FROM DUAL
Error at line 1
ORA-00932: inconsistent datatypes: expected - got CLOB
michaels> SELECT TO_CHAR (TO_CLOB ('abc')) cl
FROM DUAL
UNION
SELECT TO_CHAR (TO_CLOB ('abc'))
FROM DUAL
CL
abc
1 row selected.

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