Access function without schema defination

Hi,
i wrote a function like emofn in schema and give grant to all schemas like this
grant execute on empfn to public;
but when i log-in to schema2 or schema3 i tried to execute that function like
select empfn() function from dual; it's wont work and if try like this
select schem1.empfun() from dual it's working. but i want without schema defination any help.....

Permissions and name resolution are two different things. To call a function in another schema without specifying the schema you'll need to do one of the following
1. Create a private synonym in the calling schema
2. Create a public synonym (this is how things like DBMS_OUTPUT can work without being prefixed by 'SYS')
3. Have the caller alter session set current schema to the function owning schema.
None of these have any effect on your permission to actually use the function.

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