The correct query for the above example is:

EXEC msdb.dbo.sp_send_dbmail
@profile_name ='dbMail',
@recipients = 'dharmyog.com@gmail.com',
@subject ='Test Email',
@body ='Test Email',
@query=' select * from [dbo].[vwEmployees] Where EmployeeAge = 25',
@attach_query_result_as_file = 1;

EXEC msdb.dbo.sp_send_dbmail
@profile_name ='dbMail',
@recipients = 'dharmyog.com@gmail.com',
@subject ='Test Email',
@body ='Test Email',
@query=' select * from EmployeeDB.dbo.vwEmployees Where EmployeeAge = 25',
@attach_query_result_as_file = 1;

This way the stored procedure will execute under the msdb context and the query will execute because the database hierarchy is referenced. So the database name has to be entered in the query.

Put the database in single user mode.

ALTER DATABASE YourDBName SET SINGLE_USER WITH ROLLBACK IMMEDIATE;

Go;

Then run the following code:
DBCC CHECKDB(N'YourDBName', REPAIR_ALLOW_DATA_LOSS);

Then put the database back in multi-user mode.

ALTER DATABASE [YourDBName] SET MULTI_USER;

Go;