[SQL] R-Tree, GiST or B-Tree? I will need it?

Thanks Markus for your help (in message "How the R-Tree index works?"), but I guess, I should be more specific in my question. I have the next situation:   1-  A table (A) with data, for example:     ID   |  what  |  time   | howmuch  

[SQL] How the R-Tree index works?.

Hi, Can someone explain my how the R-Tree index works?. I just buy a Postgres's Developer book, but it only mentioned it. Thanks.     Andrés Sommerhoff