Acronym for Structured Query Language. A syntax for retrieving and manipulating data from a relational database.

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2
votes
1answer
333 views

How to return nearest point to input lat/long with distance?

I am trying to write a query with PostGIS that returns one row where the geometry of that row is the closest to an input point. I would also like to include the distance between these points in the ...
6
votes
3answers
295 views

Are there any open source Python modules compatible with arcpy that will allow complex SQL queries?

I am trying to handle string (non-geometry) duplicates in a large attribute table of a shapefile without having to convert to gdb and back or connect to a postgres db. I need to be able to use a count ...
3
votes
1answer
87 views

PostGIS - improving sql statement

I've managed to create the below statement that creates a table based on a point in polygon query. However it creates a column that gives a true/false value which I then delete out all the f values ...
2
votes
1answer
448 views

How do I select * rows of multiple columns in one query using Select by Attributes within ArcMap?

I am trying to convert a psql query string into arcpy formatting for an UpdateCursor where expression parameter: '''SELECT ...
4
votes
1answer
403 views

Is it possible to run an arcpy execute SQL method without connecting to any database or server?

I want to simply process a layer by writing a tool script in a toolbox without having to connect any database, so I think I may have to set up a workspace environment in ArcMap, but I'm not sure if I ...
7
votes
1answer
618 views

Join based on maximum overlap in PostGIS/PostGresQL?

I have two sets of polygons in two tables. The sets overlap each other. For each polygon in set A, I would like to get the ID of the polygon in set B that it overlaps the most. I'm using PostgreSQL ...
1
vote
1answer
295 views

Should I query the tab/shp file or SQL (mapserver or geoserver)?

I have tab files (or shp) with information like residents , buildings etc... I need to be able to click a point in web map and query all data that fall in certain radius. I didn't decide yet which WMS ...
7
votes
2answers
7k views

Select by Attributes based on SQL wildcard range

I want to select all the records from a geodatabase table where the string starts with a letter, so I tried SELECT * FROM tbl_names WHERE "name" LIKE '[A-Z]%' This returned no records. After some ...
3
votes
1answer
223 views

Editing and Deleting Query Tables in ArcMap

How do I edit the query for a Query Table after it has been created? How do I permanently delete a Query Table? Even after I do right-click -> remove, it still appears in dropdown lists.
4
votes
3answers
1k views

Incorporating SQL Statements in ModelBuilder?

I have a point data set where each point has a unique operator associated with it. I'd like to select by attribute = operator name and generate a new shapefile for each operator containing only the ...
3
votes
2answers
711 views

Parameterizing SQL Views Geoserver

I must do a view in geoserver. I seen some example here: http://docs.geoserver.org/stable/en/user/data/database/sqlview.html. The example show the operator like for parameterizing view. Suppose, now ...
7
votes
0answers
71 views

How can I automatically split a spatial layer to a grid [duplicate]

Possible Duplicate: Divide vector in equal smaller parts in QGIS or similar I am a software engineer and the company I work for has a project that needs some spatial data manipulation in ...
6
votes
0answers
784 views

Getting ST_Difference between two different tables in postgis [closed]

One table has a series of grid squares in it, and the other has millions of voronoi polygons in it. I need to create a table that has the difference between the two of the them so that I effectively ...
2
votes
1answer
362 views

Why is my PostGIS transformation not working?

I am using a PostGIS query to find the intersection of two streets, and then transform the results into lat/lon. The street database's current SRID is 6856, a projection I added to PostGIS myself; and ...
4
votes
1answer
929 views

raster2pgsql: Strange error when creating a table

Hi GIS Stackexchange people, When I try to load a asc file into my psql setup, I get a strange error message. I have created the sql input file via raster2pgsql -s 4236 -I -C -M gis_data.asc -F ...
2
votes
1answer
112 views

Selecting more than one feature from raster attribute table using ArcGIS Desktop?

How do I select more than one features from raster attribute table? For example: "lc_2001" = 21, 22, 23, 24 AND "lc_2006" = 11, 31, 41, 51
3
votes
1answer
304 views

How to query against time using ArcGIS Desktop?

I have a date-time field in a feature class which I want to query. The field has values like "2011-01-01 00:00:29". I want to query the data between the time 00:06:00 and 00:12:00. The date does not ...
1
vote
0answers
2k views

How to populate data from postgresql using dynamic php\html listing

In the form I created, I need two fields to be dynamically populated from the database while the other fields will be manually entered and push to the database. I have written a script that is able ...
2
votes
1answer
168 views

How to create a network with all the track points

I have created a sample network through the use of gps visualizer. Than I used the ogr2ogr function to import this data in my database. Now I have a table which holds all the track points of these ...
4
votes
1answer
1k views

Python script for constructing a WHERE clause from user input

I'm trying to construct a where clause from user input that will eventually be passed through as a SQL statement in the select tool or the select by attributes tool. I've started a script thats been ...
3
votes
4answers
14k views

Using String Functions (LEFT, RIGHT, MID) in Select By Attributes against a File Geodatabase using ArcMap 10

I finally (albeit reluctantly) made the switch from a personal geodatabase (pGDB) to a file geodatabse (fGDB) not too long ago. The main reason it took so long to switch has to do with how Select by ...
6
votes
1answer
452 views

Clarification of Logical Operators in a PostGIS Database

The following query returns this result: select count(*) from a , b where a.geom && b.geom; count ------- 66514 On a postgis 2 database. What does the logical operator AND ...
1
vote
1answer
203 views

run sql on Qgis

I want to do simple demo to our manager with quantum gis. i have buildings from my city with wgs84 projection on postgre sql database and also have non gis table which have who leaves this buildings ...
2
votes
1answer
2k views

Formatting SQL queries for use in Arcpy?

I have to make an SQL query on a column having not adequat name "type_borne_id", I couldn't make SQL queries using arcpy.Select_analysis neither selectbyattribute, but when I use select_analysis ...
1
vote
0answers
72 views

Database has duplicate values after running pgrouting

I am a newbie with postgresql and sql statements so maybe it is a trivial question, I'm sorry for that. I am working on a postgis database and try to use the pgrouting function. My goal is to store ...
3
votes
1answer
148 views

Proximity query approach

Let's say that I have two tables in PostGIS, tracks and cities, each table has two columns, in both cases the columns are called name and way, name is a string, way is a geometry. I want to retrieve ...
1
vote
4answers
1k views

How to find the center point of MULTILINESTRING?

How to find the center point of MULTILINESTRING, which lies on the multiline?
1
vote
2answers
2k views

How to offset point perpendicular to line direction in PostGIS

I have a postgis table of points, that are sitting on road centerlines (I've linear referenced them). And the second table with road centerlines themselves. The point table also has a field roadid and ...
4
votes
2answers
2k views

Publish SQL Views from Postgres/Postgis to Geoserver

I've trying and reading how to publish a Postgres/Postgis View in Geoserver. I know that I can create an SQL View in Geoserver, but I'd like to define the View in Postgres, not in Geoserver. Does ...
3
votes
3answers
1k views

How to Calculate length of polyline geometry for several tables in PostGIS?

PostGIS database contains several geometry (polyline) tables (with names "D1_r", "D2_r", "D3_r"). I calculate length for one "postgis layer" use request: SELECT ...
2
votes
1answer
141 views

Join Zip Codes Table to Nearest City from Second Table

I have two tables, siteareas and ziplookup. The former contains large cities in the US; the latter all US zips with lat/lngs. I have a foreign key into the former table in the latter: sitearea_id. I ...
2
votes
1answer
519 views

How to create a point table from a remote csv file?

The current approach that I am using to load a csv file into a PostGIS enabled database on a server is the following: -- create table CREATE TABLE points( id int, lat double precision, lng double ...
23
votes
4answers
10k views

What is the best way to join lots of small polygons to form a larger polygon?

I have the following layer using SRID 27700 in postgis: It's every administrative region in the UK, and (as you can see from the colour grouping) each of them has a text field specifying the county ...
3
votes
1answer
664 views

Duplicate ObjectID in ArcSDE Table

After making a check in from an arcpad AXF file, i remark that there's duplicate object ID records , this Arcsde pgsql table is versioned and edited by Axf checkins and a .net engine application. the ...
40
votes
2answers
5k views

Acquiring ArcGIS-like speed in Postgis

I have been using Postgis 2.0 for 3/4 of a year now and while I really enjoy using it, excessive query processing time has rendered it basically unusable for my use case. I tend to do heavy ...
4
votes
3answers
5k views

Creating join based on multiple fields using ArcGIS Desktop?

I have two feature classes in a File Geodatabase that I would like to join based on multiple fields. I've searched this site and Google and all I have come up with was to use the Make Query Table ...
1
vote
0answers
104 views

How to find loops in a network

I am a new in this field and need help, how to code using SQL spatial a function that retrieve loops in a network.The input, flag: Geography and barrier: Geography and two spatial tables, first ...
0
votes
1answer
646 views

How to select multiple features using advanced search SQL in QGIS

I have a layer of planning units covering a large area (there are over 16000 PU's). Three of the columns in the attribute table hold information about which planning units were included in the ...
2
votes
1answer
313 views

Direct DBMS sql queries and ArcSDE geodatabase

i want to make updates from Arcobjects on several tables stored on a ArcSDE 10.1 versionned geodatabase based on Postgresql 9.0.5 , none of these update require spatial data , and making these updates ...
6
votes
3answers
5k views

Select features by attribute if in Python list

I believe this will amount to largely a sql syntax question. Essentially, I am trying to complete a select by attribute in Python but based on the query of whether an attribute is present in a list. ...
1
vote
1answer
297 views

Cordenadas 2d transformacion a postgis desde QGIS

This is a three-dimensional shape file, I checked in ARCGIS, where the shape attribute indicates POINT ZM, This is the table fid 0 shape* point ZM atribut1 A atribut2 B ESTE ...
2
votes
1answer
268 views

Creating a model to run a complex query

I'm just a rookie when it comes to creating models in ArcGIS. I have two shapefiles from which I need to calculate an AVG and a MAX erosion rate for individual properties. The two shapefiles are: ...
2
votes
1answer
196 views

Postgis nested query trouble

I am having difficulty writing a nested postgis query. I have a single table from which I need to create a view in PostgreSQL. I have created the view with the following command create view ...
2
votes
0answers
206 views

Select a distinct attribute with maximum shape area

I am trying to manipulate a large dataset containing a lot of sliver polygons resulting from an overlay operations. (The eliminate tool is very time consuming to generalize them.) I identified the ...
4
votes
1answer
2k views

Performing Geoprocessing SQL Queries in QGIS from a PostGIS Database

This may be a dumb question, but is there way to run a PostGIS geoprocessing SQL query in QGIS? Specifically, I am thinking of running SQLs such as ST_Union, ST_Split etc etc. I have tried the ...
4
votes
1answer
341 views

ogrinfo SQL GROUP BY Clause

Does ogrinfo support a GROUP BY clauses? I could not find any good documentation of all the SQL syntax features it supports. I tried the following: ogrinfo . -geom=no -sql 'SELECT lsad FROM ...
4
votes
3answers
339 views

arcgis10 filter dataset

Using ArcGIS 10 SP-4 I have a large dataset of sites that needs to be filtered down to a usable size. There is an attribute for the site_ID and another one for the site_type. There are duplicate ...
3
votes
1answer
303 views

Python SQL connection causes crash in ArcMap

I have the following code which I have striped down to just included the part that is causing a crash in ArcMap. import pymssql # Connect to the Research db using Windows Integrated Authentication. ...
4
votes
1answer
295 views

How to update attribute values of points outside an area?

I have two datasets in PostGIS 1.5 (on Postgres 9.1) one of polygons and one of points. I am hoping to create a SQL command that will select all of the points in a dataset that are not within of the ...
3
votes
1answer
388 views

SQLServer generating invalid WKT

I am a GIS novice using SQL 2008, with C# and the NetTopologySuite WKTReader type to work with some geometries. I have some data which I have been able to save into the database but when I read back ...