Read the original article: Public Roles in Oracle
Roles in relational databases make it easier to grant and revoke privileges from multiple users at once. Multiple users can be grouped into one or more roles in a database. Rather than revoking or granting a privilege to a user or a group of users, the privilege can be granted or revoked from the ROLE. While users can create their own roles and assign one or more privileges to the roles, most databases come with a pre-defined role called PUBLIC….
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Read the original article: Public Roles in Oracle