revoke drop and alter table

I have revoked create table from all schemas but how to revoke alter and drop table. I granted roles connect,resource to schema and revoked create table from them. I grant create table to schema when required. I tried from dba studio but failed. Please help. drop any table and alter any table are the privileges. These are not granted to schema but the guys and gals can alter and drop tables as of now.
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k_murli_krishnaAsked:
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p_yaroslavConnect With a Mentor Commented:
Hello!

You cann't revoke these privileges from user, which own this objects, but you can create new schema and create public synonyms on objects to other users. In this case you may fine control access to objects.

Best regards!
Yaroslav.
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WadhwaCommented:
Hi,
you can not revoke alter and drop table privileges if you login to user account who owns the objects.
suppose emp table are in scott account. you can not revoke drop and alter privilged of emp table from scott account.

if you connect as scott there is no way you can avoid to drop or alter a table owned by scott.

Hope this helps
Sameer

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