I have this sql query using Commont Table Expression:

with a as(select top 1 flow_id from flow where invoice_id>0)
,b as(select '45' as col2)
select * from a,b

if none of the rows satisfy the condition invoice_id>0 in the flow table, then I get the following result:

I want the following result even if no records are found from flow table:

Can this be done?