>>>
>>>select * from dbo.part_file p where not exists (select 1 from dbo.part_used pu where used_date >='20100101' and pu.part_pk = p.part_pk)
>>>and exists (select 1 from dbo.part_used pu where used_date <'20100101' and pu.part_pk = p.part_pk)
>>
>>Do I understand correctly that you use aliases (e.g. 'p' and 'pu') for readability but the expression can be used without them, correct?
>
>You can write
>
>part_pk = part_file.part_pk
>
>and not use aliases. But you do need to connect the main query with the exists / not exists subquery. I think using aliases is the simplest way to relate the main query and subquery.
The reason I cannot use aliases is that my VFP code uses SFQuery (as a filter) and SFQuery returns the expression using the actual table names. So if I use the alias, the entire SQL Select does not work (error message). By removing the alias, everything works.
Thank you.
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