Oracle : Ошибка ORA-22998

"CLOB or NCLOB in multibyte character set not supported"
*Cause: A CLOB or NCLOB in a fixed-width or varying-width multibyte
character set was passed to a SQL character function which
does not support multibyte LOB data.
*Action: Use DBMS_LOB functions such as DBMS_LOB.INSTR() and DBMS_LOB.SUBSTR()

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