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02.26.2008 at 10:17PM PST, ID: 23196107
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8.9

Faster searching via structure

Asked by dennismv in MySQL Server

I want to box off a geographical area of customers via lat and lon as in variations below:

Variation 1:
customers (id,data,zipcode);
zipcodes (zipcode,lat,lon);
SQL:  select * from customers,zipcodes where customers.zip=zipcodes.zip and lat between a and b and lon begween c and d;

Variation 2:
customers (id,data,zipcode,lat,lon);
SQL:  select * from customers where lat between a and b and lon begween c and d;

Question:  My goal is to get every reasonable bit of speed.  

I get a feeling that the 2nd one is faster as there is no join and thus loading the records can be done a bit faster (less disk seeks if data is sorted according to the index).

The 1st variation however is more "policitally correct" as it's normalized.  I do want speed, however. Is my impression that 2nd one is faster correct ?  Start Free Trial
[+][-]02.27.2008 at 12:47AM PST, ID: 20992341

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About this solution

Zone: MySQL Server
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Solution Provided By: Nellios
Participating Experts: 1
Solution Grade: A
 
 
[+][-]03.06.2008 at 08:04PM PST, ID: 21067258

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