select *
from aTable
where dbms_lob.compare(aClobColumn, 'value') = 0
select *
from aTable
where dbms_lob.compare(aClobColumn, 'value') = 0 //implicitly converting value to clob datatype
//for explicitly converting 'value' to clob data type.
select *
from aTable
where dbms_lob.compare(aClobColumn, to_clob('value')) = 0
//both does the same thing