You can define data permissions for both Security Users and Security Groups. Because each type of permission offers different advantages, you will probably want to use a combination of both Security User and Security Group permissions to achieve the specific permissions that are needed for your system.
Note: Data permissions are cumulative. A given Security User will be granted the sum of all permissions assigned to him and to all the Security Groups of which he is a member. In addition, permissions that are granted to Security Groups spread down automatically to all of their security subgroups.
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