Convert string to clob
SQL> SQL> declare 2 3 c1 clob := to_clob('abc'); 4 c2 clob; 5 6 begin 7 case c1 8 when to_clob('abc') then dbms_output.put_line('abc'); 9 when to_clob('def') then dbms_output.put_line('def'); 10 end case; 11 12 c2 := case c1 13 when to_clob('abc') then 'abc' 14 when to_clob('def') then 'def' 15 end; 16 17 dbms_output.put_line(c2); 18 19 end; 20 / abc abc PL/SQL procedure successfully completed. SQL>