Please help me with the query

That's not how queries work.  They return records if they exist, not if they don't.  Can you tell us what you are trying to accomplish with this "zero" record?

Try this.

Select num,name,zip from tblMain
union all
select 0,null,null where not exists (select 1 from tblMain)

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Thank you, guys.
To ArmenStein:i need to get the count of records even if there is no records. ---in this case is Zero is my result. I need the count to add to one more query results to get the final number
To: Sharath_123: i am getting the error message
Syntax error(missing operator) in query exression 'null where not exists (select 1 from tblMain)
'

Check this

Select num,name,zip from tblMain
union 
select 0,null,null from tblMain where not exists (select 1 from tblMain)

Select allOpen in new window

thank you, it did not give me the error, but it does not give me the zero
i added the extra field Date
what i want, i think it make more sense, show me * from the table where date is not todays

and it stll gives me just a header:
num name zip Date

and i want like that
num name zip Date
0
is this possible???

Select num,name,zip,Date from tblMain where Date =format(now,"mm/dd/yyyy")
union 
select 0,null,null,null from tblMain where not exists (select 1 from tblMain)

Select allOpen in new window