Here's an example of including the results of a query in the body of an email:
exec msdb.dbo.sp_send_dbmail
@profile_name = 'SQL Server Agent',
@recipients = 'me@mycompany.com',
@subject = 'Results of the query',
@body = 'Check this out: ',
@query = 'select ...,
@query_result_header = 0,
@query_result_width = 500,
@exclude_query_output = 1
See sp_send_dbmail in BOL for more arguments and examples.