Change the Clob field type in Oracle to Varchar2 type instance

--Create a new field alter table KQSERVER add temp VARCHAR2(2000); --Assign
the original field data to the new field
update KQSERVER set temp=SERVER_IMG; --Delete the
original field
alter table KQSERVER drop column SERVER_IMG; --Rename the
new field For the original field
alter table KQSERVER rename column temp to SERVER_IMG;