How can I create a polygon using fields in PostgreSQL?
polygon, postgis, postgresql
Solution
The syntax for a regular postgres polygon is more like:
`insert into geo_table values (1, '((2,2),(3,4),(3,6),(1,1))');`
Where 1 is some id and the quoted entry is the polygon. I would expect the query to be similar, you probably need parentheses etc for the coordinates. Typically for geospatial data you want (Lon Lat) coordinates. Postgis also takes WKT statements like:
`GeomFromText('POLYGON((long1 lat1, long2 lat2, long3 lat3))')`
Problem
I have 8 real values in a table that I'd like to combine into a polygon. I haven't been able to figure out how to create a polygon using these values though. I keep trying variations of ``` SELECT polygon(lat1,lon1,lat2,lon2,lat3,lon3,lat4,lon4) FROM table; ``` but keep getting errors about the polygon function not existing or an invalid input syntax for type polygon. Has anyone done this before?