How to check object (table) privileges in Oracle

Object and table privileges granted directly to a user, with the grantor and whether the grant can be passed on. Privileges inherited through roles are covered by the full privilege script. Prompts for a username.

SELECT owner,
       table_name,
       privilege,
       grantable,
       grantor
FROM   dba_tab_privs
WHERE  grantee = UPPER('&&username')
ORDER  BY owner, table_name, privilege;