Re: sql to find a numeric range inside another range?

"dbarchitech" <noble_kid_at_mac.com> wrote in message news:9d3dc423.0403041227.79c5ef4e_at_posting.google.com... | "Mark C. Stock" <mcstockX_at_Xenquery .com> wrote in message  news:<ePydnbw8FsucidjdRVn-uA_at_comcast.com>...
| > "dbarchitech" <noble_kid_at_mac.com> wrote in message
| > news:9d3dc423.0403021434.18a3078e_at_posting.google.com...
| > | hi,
| > |
| > | i'm building a query to find narrow ranges of zip codes within broader
| > | ranges in a table (for tax purposes). for example:
| > |
| > | LOW_ZIP HI_ZIP
| > | 23400 23499
| > |
| > | need to find
| > | 23401 23402
| > | 23403 23440
| > | 23441 23... you get the picture. :)
| > |
| > | so, each row has a low value and a hi value, then i need to run a
| > | subquery to take those values and find narrower ranges. any ideas?
| >
| > yeah, but you got to show us yours first ;-)
| >
| > ;-{ mcs

|
| yeah, well mine doesn't work!!! :-$
|
| select sales_tax_id,
| from_postal_code,
| to_postal_code
| from ar_sales_tax a,
| (select from_postal_code as fpc,
|            to_postal_code as tpc
|            from ar_sales_tax
|            where rowid = rowid) b
| where from_postal_code between b.fpc and b.tpc
| and to_postal_code between b.fpc and b.tpc
| and end_date is null
|
| i need to somehow scan the entire table row by row looking for records
| that fit within the ranges... i'm thinking i may need to do this using
| a cursor.
|
| -cam

well, know we know that you tried something!

you won't need a cursor, and you won't need to be one either ;-)

i'll take a stab at it, but it would be nice if you could elaborate on 'doesn't work'

regarding your query

    select ...
    from ar_sales_tax a

                ,(
                    select ...
                    from   ar_sales_tax
                    where rowid = rowid
                 ) b

the rowid=rowid is always true, don't you think? so there is no added value in that statement and there is no added value in the in-line view (the in-line subquery you've aliased as 'b'

so, if that's simplified to

    select ...
    from ar_sales_tax a

             , ar_sales_tax b
    where a.from_postal_code between b.from_postal_code and b.to_postal_code

    and a.to_postal_code between b.from_postal_oce and b.to_postal_code

    and a.end_date is null

all that's going to do for you is give you rows in the 'A' pass at your table where rows are found in the 'B' pass with a range of codes that overlap each of the codes from the 'A' pass -- but it doesn't tell you anything about the relationship between the two passes, and doesn't limit the results to any specific pair of codes

assuming you're looking for ranges narrower than your 23400/23499 sample, how about narrowing one of the passes by that pair of values? or returning the range from the A pass and the range from the B pass in your select clause, so that you've got something to work with?

;-{ mcs Received on Thu Mar 04 2004 - 22:21:09 CET