I am trying to run a buffer around a polyline (geography). My first attempt below (based on ST_Buffer documentation:

SELECT ST_Buffer(ST_Geomfromtext(i30.geog),10,'endcap=round join=round');

gives an error:

missing FROM-clause entry for table "i30"
  • The error message is correct -- You did not include a required FROM clause. The examples you were working from don't include a FROM because a table isn't involved, but if you have a table, you need to reference it in the FROM: SELECT ST_Buffer(ST_Geomfromtext(i30.geog),10,'endcap=round join=round') FROM i30;
    – Vince
    Jul 14, 2015 at 17:49
  • Thanks, I added a from clause to the end of the statement. i30 is a table. SELECT ST_Buffer(ST_Geomfromtext(i30.geog),10, 'endcap=round join=round')FROM i30; Now getting a hint: No function matches the given name and argument types. You might need to add explicit type casts". Jul 14, 2015 at 18:03

1 Answer 1


What's i30? If it's a table, you'll need something like:

SELECT ST_Buffer(geog,10,'endcap=round join=round') FROM i30;

and your result will have a buffered geography for each row in i30.

  • Toby.. looking back at the information in the example I changed my attempt. to the following. SELECT ST_BUFFER(i30.geog, 10) FROM i30; It worked. THANKS. Jul 14, 2015 at 18:16
  • 1
    yeah no need for ST_GeomFromtext when you have a geom field already... Jul 14, 2015 at 18:18
  • 1
    Thanks, @mapBaker - I just pasted that from the question. Now edited. Jul 14, 2015 at 18:25

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