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- From: email@example.com
- To: "John F. Schlesinger" <firstname.lastname@example.org>,'rsanford' <email@example.com>, firstname.lastname@example.org
- Date: Sun, 27 Aug 2000 23:56:42 -0400
John F. Schlesinger asked,
> Well, the problem isn't whether the query engine needs to know the data
> type, it is whether I need to know the data type to formulate the query -
> maybe I'm barking up the wrong tree?
Well, maybe not... Back to an SQL example, if I ask
select employee_name, employee_age from employee
I don't have to know the data type - unless the database is going to stuff
it into a memory location for me. Then I would have to know, although the
machinery might handle this for me. But the query might well return text,
in which case I will get a string that represents the age value. Or I might
be able to cast the age to a string within the query itself.
So once again, it depends!