Find points within a distance using MySQL

I have a mySQL table with user name, latitude and longitude of the user. I would like to get a list of user who are inside the circle or square of a given latitude and longitude with given distance. For example my input Lat= 78.3232 and Long = 65.3234 and distance = 30 miles. I would like to get the list of users who are inside 30 miles distance from the point 78.3232 and 65.3234. Is it possible to solve this with single query? Or can you give me a hint start solving this query? I am new to the geo based information.

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Why not PostGIS ? If you are starting geo project you can still change your stack –  simplexio Jan 14 '13 at 7:32

The SQL statement that will find the closest 20 locations that are within a radius of 30 miles to the 78.3232, 65.3234 coordinate. It calculates the distance based on the latitude/longitude of that row and the target latitude/longitude, and then asks for only rows where the distance value is less than 30 miles, orders the whole query by distance, and limits it to 20 results. To search by kilometers instead of miles, replace 3959 with 6371.

SELECT
id, (
3959 * acos (
* cos( radians( lat ) )
* sin( radians( lat ) )
)
) AS distance
FROM markers
HAVING distance < 30
ORDER BY distance
LIMIT 0 , 20;


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I'm getting a syntax error in my select using this, "#1582 - Incorrect parameter count in the call to native function 'radians' what could it be? –  bluantinoo Nov 29 '14 at 2:09
Found: I had the lng variable empty! sorry! –  bluantinoo Nov 29 '14 at 10:38

Mapperz's answer is invalid. Sinus must be calculated from latitude and NOT from longitude. So corect SQL statement is:

SELECT
id, (
3959 * acos (
* cos( radians( lat ) )
* sin( radians( lat ) )
)
) AS distance
FROM markers
HAVING distance < 30
ORDER BY distance
LIMIT 0 , 20;

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Here is my variant of query, seems a little bit easier (http://dexxtr.com/post/83498801191/how-to-determine-point-inside-circle-using-mysql)

SELECT
*
FROM
locator
WHERE
SQRT(POW(X(center) - 49.843317 , 2) + POW(Y(center) - 24.026642, 2)) * 100 < radius

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