Re: Cursor looping versus set-based queries

Robert Klemme (bob.news@xxxxxxx) writes:
Erland Sommarskog wrote:
* Different data from the same row needs to be inserted into multiple
tables. "Common sense" (maybe "gut instinct" is better) says to handle
each row as a "unit". Seems weird to process the entire set for one
table, then to process the entire set AGAIN for another table, and then
YET AGAIN for a third table, and so on.

I'm not sure that I understand this point. As I mentioned, I usually
have my input to my set-based procedures in a table, so I don't really
see the problem.

I think what Jay is up to here is mapping of an OO model to a relational
model. There is one "master" table which represents the root class of
his hierarchy and several tables for specific types. I've never worked
with user defined types but maybe these are an option here as well.

I suppose you are thinking of the CLR UDTs added to SQL 2005. No, they are
not an option here. CLR UDTs are for small values that always go together,
and where you rarely would search for the individual values. Personally, I
see CLR UDTs as a fairly marginal benefit.

As for the structure of Jay's tables, I have no problem to understand it,
as I work with securities myself, and different classes of securities
have different properties.


--
Erland Sommarskog, SQL Server MVP, esquel@xxxxxxxxxxxxx

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