Hello, I am developing an application to find whether two cars are in each other communication range or not. I have two tables like receiver and transmitter. i would like to know if receiver is in 100 meters range of transmitter or not. Since i am using PostgreSQL first time, i donno much about its functions and commands, but i have found that there is ST_Within(), which can be used for my work. I tried but it gives me lot of errors, probably because of data types of my latitude and longitude. they are in two different columns with datatype as double precision.
please tell me what is wrong, and how should i use ST_WITHIN for my work. Or tell me any other way of knowing if two objects are in range of each other.
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