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Design and optimise an SQL query for plotting markers on Google Maps

UPDATE: Just to clarify, I ONLY need the SQL query, I do not need any PHP or other code. I have a working solution already and just need to expand the SQL. I am a developer and will add your SQL into my existing code.

I have a website that uses Google Maps to plot custom markers from a SQL database. The markers consist of store locations for ~10,000 currency suppliers in the UK. Visitors can enter their current location and see a list of currency suppliers within a 30-mile radius along with the supplier's corresponding exchange rate for a given currency.

The problem I have is some suppliers have dozens of stores within a 30-mile radius of the search location which can look messy when the markers are plotted on the map.

What I would like is to redesign the SQL query that finds these stores so that it does the following:

1) Find all stores within a 10-mile radius of the search location.

2) If there are multiple stores found for the same supplier, only return the first 5 for that supplier based on distance from the search location (i.e. the 5 closest stores).

3) Return a maximum of 50 results.

The data is stored across three tables:

Table 1 contains supplier information (name, website etc.).

Table 2 contains marker information (including lat, long coordinates) for each store.

Table 3 contains exchange rate information.

The primary key in table 1 is a secondary key in tables 2 and 3. The final query must be fairly optimised (<1 second) as it will be placed on a medium-traffic website. I am open to changing the structure of one or more tables if necessary but would prefer not to.

Kĩ năng: Lập trình cơ sở dữ liệu, MySQL, PHP, SQL

Xem nhiều hơn: display google map using latitude and longitude in php, adding markers to google maps from database, using php/mysql with google maps, google maps php mysql demo, show multiple markers on google map from database php, google maps load markers from json, how to show markers location in google map dynamically from database in php, google maps api, load markers google maps, custom markers google maps numbers, numbered info markers google maps javascript example, add custom markers google maps database, pin markers google maps, popup windows markers google maps, load dinamic markers google maps markers, costum markers google maps numbers, view markers google maps, plotting circles google maps, load nearest markers google maps, query markers google maps

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( 0 nhận xét ) Santa Pola, Spain

ID dự án: #19754023

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