Try building a stored procedure something like below and schedule it to run as a job:
create procedure [dbo].[sp_send_merchant_email]
as
Begin
declare @recordCount int
select @recordCount = isnull(count(*), 0)
from merchand_history
where stock_code = 'zzz007' and create_timestamp >= getdate()
order by create_timestamp desc
IF (@recordCount > 0)
begin
EXEC msdb.dbo.sp_send_dbmail
@profile_name = 'YourProfile',
@recipients = 'recipients@yourcompany.com',
@query = 'select * from merchand_history
where stock_code = ''zzz007'' and create_timestamp >= getdate()
order by create_timestamp desc' ,
@subject = 'Merchant Email ',
@Body = 'Email Merchant..... ' ,
@attach_query_result_as_file = 1 ;
End
else
begin
EXEC msdb.dbo.sp_send_dbmail
@profile_name = 'YourProfile',
@recipients = 'recipients@yourcompany.com',
@BODY = 'No data returned ',
@subject = 'Merchant Email'
End
End;