db_datareader: The db_datareader role has the ability to run a SELECT statement against any table or view in the database.
db_datawriter: The db_datawriter role has the ability to modify via INSERT, UPDATE, or DELETE data in any table or view in the database.
db_denydatareader: The db_denydatareader role is the exact opposite of the db_datareader role: instead of granting SELECT permissions on any database object, the db_denydatareader denies SELECT permissions.
db_denydatawriter: db_denydatawriter role serves to restrict permissions on a given database. With this role, the user is preventing from modifying the data on any data via an INSERT, UPDATE, or DELETE statement
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