Check permissions given to a database role

As a Database Administrator, you may need to identify the permissions that have been granted to a user-created database role. To begin, use the query provided by Microsoft to list all of the database roles that are currently present in the database.

Ref. sys.database_role_members

The following query returns the members of the database roles.

SELECT DP1.name AS DatabaseRoleName,   
   isnull (DP2.name, 'No members') AS DatabaseUserName   
 FROM sys.database_role_members AS DRM  
 RIGHT OUTER JOIN sys.database_principals AS DP1  
   ON DRM.role_principal_id = DP1.principal_id  
 LEFT OUTER JOIN sys.database_principals AS DP2  
   ON DRM.member_principal_id = DP2.principal_id  
WHERE DP1.type = 'R'
ORDER BY DP1.name;

Now to check the list of all Permissions for a given user DB role use the below query

SELECT DB_NAME() AS DatabaseName
      ,DatabasePrincipals.name AS PrincipalName
      ,DatabasePrincipals.type_desc AS PrincipalType
      ,DatabasePrincipals2.name AS GrantedBy
      ,DatabasePermissions.permission_name AS Permission
      ,DatabasePermissions.state_desc AS StateDescription
      ,SCHEMA_NAME(SO.schema_id) AS SchemaName
      ,SO.Name AS ObjectName
      ,SO.type_desc AS ObjectType
  FROM sys.database_permissions DatabasePermissions LEFT JOIN sys.objects SO
    ON DatabasePermissions.major_id = so.object_id LEFT JOIN sys.database_principals DatabasePrincipals
    ON DatabasePermissions.grantee_principal_id = DatabasePrincipals.principal_id LEFT JOIN sys.database_principals DatabasePrincipals2
    ON DatabasePermissions.grantor_principal_id = DatabasePrincipals2.principal_id
WHERE DatabasePrincipals.name = 'db_executor' -- Change the Role Name