添加到SQLAgentReaderRole角色后报拒绝SELECT权限

最近有点大意，同事需要查看作业的权限，"理所当然"就将对应登录名添加到SQLAgentReaderRole角色。


既然SQLAgentReaderRole角色有"合适"的权限，直接利用角色有何不妥？
在不做其他限制的情况下，添加用户到SQLAgentReaderRole角色，通过SSMS连接在对象资源管理器中便可查看所有作业。
如果用户没有[VIEW ANY DATABASE]的权限，对象资源管理器中它看不了数据库列表，也看不了作业。如果只提供一个类似查询窗口页面，用户输入SQL语句执行返回结果。

granteename    objectname    columnname    class_desc    permission_name    state_desc
SQLAgentOperatorRole    sp_enum_login_for_proxy    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentOperatorRole    sp_help_alert    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentOperatorRole    sp_help_notification    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentOperatorRole    sp_help_targetserver    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentOperatorRole    sp_purge_jobhistory    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentOperatorRole    sysalerts    NULL    OBJECT_OR_COLUMN    SELECT    GRANT
SQLAgentOperatorRole    sysnotifications    NULL    OBJECT_OR_COLUMN    SELECT    GRANT
SQLAgentOperatorRole    sysoperators    NULL    OBJECT_OR_COLUMN    SELECT    GRANT
SQLAgentUserRole    sp_add_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_add_jobschedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_add_jobserver    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_add_jobstep    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_add_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_addtask    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_attach_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_check_for_owned_jobs    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_check_for_owned_jobsteps    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_jobschedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_jobserver    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_jobstep    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_jobsteplog    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_delete_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_detach_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_droptask    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_enum_sqlagent_subsystems    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_get_job_alerts    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_get_jobstep_db_username    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_get_sqlagent_properties    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_category    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobactivity    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobcount    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobhistory    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobhistory_full    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobhistory_sem    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobhistory_summary    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobs_in_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobschedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobserver    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobstep    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_jobsteplog    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_operator    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_proxy    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_help_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_maintplan_subplans_by_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_notify_operator    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_start_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_stop_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_uniquetaskname    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_update_job    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_update_jobschedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_update_jobstep    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    sp_update_schedule    NULL    OBJECT_OR_COLUMN    EXECUTE    GRANT
SQLAgentUserRole    syscategories    NULL    OBJECT_OR_COLUMN    SELECT    GRANT
SQLAgentUserRole    sysjobs_view    NULL    OBJECT_OR_COLUMN    SELECT    GRANT
SQLAgentUserRole    sysschedules_localserver_view    NULL    OBJECT_OR_COLUMN    SELECT    GRANT

View Code
权限分配来看，SQLAgentUserRole分配了基础权限(视图、存储过程中有对角色的判定限制操作)；SQLAgentReaderRole没有额外权限；SQLAgentOperatorRole额外有警报、通告、操作员权限。
SQLAgentReaderRole、SQLAgentOperatorRole是SQLAgentUserRole的角色成员，SQLAgentOperatorRole是SQLAgentReaderRole的角色成员。
SQLAgentReaderRole对视图msdb.dbo.sysjobs_view有SELECT权限(继承SQLAgentUserRole的权限)，GUI界面操作时从视图获取数据。所以添加到此角色后，展开作业就能返回所有作业。
我们用语句查询作业时，习惯直接从msdb.dbo.sysjobs这类表入手。但SQLAgentUserRole角色并没有对此类表有SELECT权限，因此常规语句会报拒绝对对象的SELECT权限。
出现问题的根源是，自己没有深入了解本质，自己以为SQLAgentUserRole角色直接在表上有权限，未曾深入查看它的权限集中在对存储过程的执行和视图的查询。
很多时候我们使用习以为常且单方面是正确的方式操作，最终却没得到预期的结果，这时我们就要检查操作的是否是同一对象。