关于Microsoft SQL Server中db_datawriter固定数据库角色是否具备读取权限的技术问询

Great question—this is a common point of confusion with SQL Server's fixed database roles, so let's break it down clearly:

No, the db_datawriter fixed database role does NOT have read (SELECT) permissions by default.

As you referenced, the sole purpose of this role is to grant data modification rights on all user tables:

• INSERT (add new records)
• UPDATE (modify existing records)
• DELETE (remove records)

SQL Server intentionally splits read and write permissions into separate fixed roles for granular access control:

• db_datareader is the role that grants full SELECT access to all user tables in the database.
• db_datawriter only handles write operations, with no implicit read access.

If a user is only assigned to db_datawriter, they'll get a permission denied error if they try to run a SELECT query on any user table. To give them read access, you have two options:

1. Grant explicit SELECT permissions on specific tables/views:

   USE YourDatabaseName;
   GRANT SELECT ON dbo.YourTableName TO YourUserName;
   

2. Add the user to the db_datareader role to give them read access to all user tables:

   USE YourDatabaseName;
   EXEC sp_addrolemember 'db_datareader', 'YourUserName';
   

This separation follows the principle of least privilege—you can give users only the exact permissions they need, rather than bundling read and write access together.

内容的提问来源于stack exchange，提问作者Summer