Differences between Roles, Schemas, Users and Logins.

Question

I need differences between Roles, Schemas, Users and Logins. Can anyone help me. Thanks in advance

Answer 1

Roles:
I think of creating roles in the database to group users of like
function.  Roles are granted certain permissions in the database.  You
should become familiar with the fixed database roles since these will be
utilized once you start creating users within the database.  Also, once
you see the type of permissions that are granted to each role, is makes
more sense.
Schema: there can be several schemas in a database,
which will house different types of objects such as tables, indexes,
stored procedures, functions,  etc.  Users own schemas.  Looking into
the AdventureWorks database illustrates this concept, with several
schemas like HR, Production, etc.
Login: Think about login as
gaining access to the SQL Server instance.  If a user account is not
granted any permissions within the instance, you basically just were
able to unlock the door and enter the room, by creating a user you then
grant access to the database objects or principals, and can begin to
work with them. 
Users:  Users own schemas, and as such will be
able to manipulate the objects they own.  Some of the manunipulations
are very permissive, such as creating tables, indexes, stored
procedures, functions, etc.  These are developers and administrators.
Users
are created and granted permissions for application use, which will
have select, update, insert, and delete and execute permissions  to a
finite set of objects in the schema, for which the application will need
to function properly.
In a client server database, as an
example, of the structure.  Roles were defined which provides the
permissions to the database objects in the database, which only has one
schema 'dbo'. One SQL server login was created with the same username,
and dbo is the assigned default schema, and the roles assigned to that
username. 
In the application, each specific user is given there own
"application" login which is mapped to the one defined sql server
login.
Ahsan Kabir Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread. http://www.aktechforum.blogspot.com/