[thelist] Zip/Postal Code Radius
Howard Cheng
howcheng at ix.netcom.com
Thu Dec 19 16:09:01 CST 2002
Assuming you have the zip code field indexed (it's the primary key in my
table), this actually goes pretty quickly. This is what I got out of Query
Analyzer:
Airport Index Scan: 0.156572 45%
Cities Index Seek: 0.006408 2%
Inner Join: 0.093754 27% (including the WHERE computation)
Compute Scalar: 0.000415 0%
Sort: 0.089138 26%
---------------------------------------
TOTAL 0.350022 100%
So all of that in less than half a second. And our SQL Server is our
development one, so it's not even on a really great machine.
The Cities table has 42,242 rows. The Airports table has 13,828 rows.
At 03:31 PM 12/19/2002 -0500, Joshua Olson wrote:
>While not REALLY being hard (like you explained), I can't imagine that the
>query you provided runs very quickly due to all the math involved in the
>conditional. :-) But, you have done a great service by actually providing
>the query and the equation... thank you. What sort of speed results did you
>get with it?
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Howard Cheng
http://www.howcheng.com/
howcheng at ix dot netcom dot com
AIM: bennyphoebe
ICQ: 47319315
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