Question

How to grant select/update/insert/execute permission to all tables/procedures in database? Create role?

Because I want to have guests(all select permissions to some tables), users(only select,update,insert permissions to tables) and administrators(all permissions to all objects in database)

Answer 1

Approach 1) Useful when there are large no. of users.
GRANT SELECT, INSERT, DELETE, UPDATE on SCHEMA::SchemaName to Principal –often DBO for Schema

For the Principal, it is FAR preferrable to use a role and not a single user, Unless you just have a few users, it usually simplifies your management.

Now, if a utility schema is added, the user has no access to the data, but, if a table is added to the SchemaName schema, they automatically have access.

Approach 2) useful in case of few users.
adding the user to db_datareader and db_datawriter roles if you need access to all tables in the database. Its short & simple.

USE [DBName]
GO
EXEC sp_addrolemember N'db_datawriter', N'UserName'
GO
EXEC sp_addrolemember N'db_datareader', N'UserName'

Reference : http://social.msdn.microsoft.com/Forums/en/transactsql/thread/1489337c-56c9-4bb8-9875-3a75be7596be