Hello everybody For another time, i ask your help and your experience!! Specifically, i want to create voronoi diagrams with postgis, and i found the following intersting link http://www.bostongis.com/PrinterFriendly.aspx?content_name=postgresql_plr_tut02 So, i have installed the pl/r language and i have run the voronoi function. But, i don't understand what kind of my data i have to place, at the below line code WHERE town = ''BOSTON'' AND grades LIKE ''%3%'' AND type = ''PUB'' why the writer use a WHERE statement ?? what does mean the variable "%3%" ??
Thankss
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