Tagged Questions

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

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1answer
32 views

PGrouting encapsulated queries error [quotes problem]

I'm facing a quote problem on a pgrouting query. What I'm thinking is wrong is that my query only works if I use one, then four, then eight quotes on encapsulated queries. Is there a way to simplify ...
1
vote
2answers
102 views

adding geometries to a source, target table for multiple rows in pgrouting

I am having an issue trying to perform the pgr_dijkstra algorithm and getting back a line in my table for multiple rows. I have a table that has a columns of source, target node id's but I cannot ...
0
votes
1answer
164 views

How to write to Sql server from MapBasic and insert rows

I have created a table in Sql server 2014 with the columns: Id (int), Geom (geometry), RouteId (int), Desc (varchar(MAX)) I have succeeded in making the table mappable through MapInfo I have checked ...
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votes
0answers
36 views

CartoDB - renamed table and changed API calls but still failing

I used the SQL API to make a new table with some data from an existing table. I also renamed all the API calls in my code to point to the new table. However, no point markers show up on my map now. ...
1
vote
1answer
83 views

Counting event points by categories and matching to polygons, normalized by population

I'm new to CartoDB, but I'm a seasoned user of ArcGIS. My university was sorely lacking in GIS training; I only learned how to create static maps, not web content. After graduating 3 years ago, I'm ...
1
vote
2answers
225 views

Sql Query for percent of buffer filled with objects

Hi I am trying to write a query to find the percentage of a buffer polygon (Called 250_Buffer) that is filled with or contains other polygons in another layer (Called Development) any help that you ...
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0answers
107 views

Geoserver SQL View layer not displaying on map

I am trying to create a SQL View in GeoServer from my SQL Server 2008 R2 data store. It is a very basic query: SELECT [Id] ,[Location] FROM [schema_name].[table_name] I set the Id column, ...
1
vote
1answer
127 views

In cartodb, how can I insert a new row in a table via API?

We've discovered cartodb and we want to use it in our project, but in the API documentation we've only seen the sql.execute() method (docs) in order to insert a now row in a table. Is this the way to ...
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0answers
38 views

How to determine distances of points from closest line? (Mapinfo or QGIS) [duplicate]

I have a set of points and a set of lines. I'd like to know distances of the points from the closest line... answering the question "how many points are within 500m to 1000m of one of the lines, how ...
2
votes
1answer
72 views

Get list of all tables in CartoDB account with SQL statement?

How can I get a list of all available tables in my own authenticated CartoDB account with a SQL statement? This returns null: SELECT table_name as t FROM information_schema.tables WHERE table_schema ...
2
votes
2answers
149 views

How to get the data type of each column from a postgis table

I need to get the column data types of all columns in a table, including the geometry types. What I wanted to know is if there is a function or SQL that gives something like this: column_name | ...
4
votes
1answer
170 views

How to use %value% (from For iterator) in SQL expression of Calculate Field in ModelBuilder?

I have a shapefile with data of fish specimens and the coordinates where they were tagged for research purposes. One of the fields in the attribute table of these shapefiles is the fish length in ...
-1
votes
1answer
65 views

How to Label Field With Multiple Selected Values?

I have a shape named "Subdistrict" and it shown on Attribut Table like this : No | subd | village 1 | town1 | v1 2 | town1 | v2 3 | town1 | v3 4 | town2 | v4 5 | town2 | v5 6 | town2 | ...
0
votes
1answer
39 views

Choropleth map turns one color when filtered, sql error

My data is generating a choropleth map perfectly but when I try to filter (both in the filter tab and by writing my own SQL) it turns all one color and tells me I have an SQL error. This happens even ...
0
votes
0answers
39 views

Why there is no output (path) for Dijkstra in pgrouting

I have a road network table and I am implementing pgRouting. everything was working fine previously but now there is something odd here. I am getting no route now. I am checking through sql query in ...
1
vote
2answers
560 views

QGIS Select by Expression

A basic QGIS 2.2.0-Valmiera, Select By Expression - Field Calculator question. Introduction I am a geologist searching through a geological database (see attached figure). I have a shape file and ...
1
vote
1answer
39 views

Keep column titles when exporting SQL query in MapInfo

Is there a way to keep column titles when exporting a query in MapInfo as a csv or a new tab. This is my result: And my export looks like this: It's not a major issue, I jus like saving myself ...
0
votes
1answer
38 views

How do I show the created_at column at my infowindow?

Fields like created_at, updated_at or cartodb_id are a greyed out thus not allowing us to add it to the info window. Is there a way to extract the data from default fields in cartodb?
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votes
2answers
90 views

New line in MapInfo SQL Select

Is there a character I need to use to state a new line in the MapInfo SQL Select box (e.g like ; in SQL Management Studio) or is this not possible. The highlighted (yellow) area is where the new line ...
1
vote
0answers
67 views

How to Build Query Table from two OLE DB tables using ArcPy?

When I run the following code to create a subset of a table, the error says "An invalid SQL statement was used" [Query]. The error shows in line 39. Is there any idea you can figure this out? import ...
1
vote
1answer
28 views

why is the CDB_QuantileBins function not found in cartoDB?

What is wrong with the following SQL query on my data? I found pretty clear documentation (1,2) that the function is supposed to work. SELECT CDB_QuantileBins(array_agg(numeric_column_of_mine), 10) ...
0
votes
1answer
62 views

how to run a PostgreSQL query on CartoDB tables?

I want to run a VACUUM FULL on my table, but I don't think it's working. Simply sandorl.cartodb.com/api/v2/sql?q=VACUUM&api_key={MYKEY} results in long output, apparently only repeating for ...
0
votes
1answer
53 views

CartoDB simple process

I'm attempting to create a simple process with CartoDB, I have a layer with number of polygons, I want to to run a SQL with a multipoint line to report which polygons were intersected.
1
vote
2answers
145 views

How to select objects by N:M join?

I have a layer with some geometries and a data layer that defines an M:N relation. Is there any way I could select (on the map) objects that are in relation with specific id? Basically I would like to ...
0
votes
1answer
21 views

whereClause syntax for Cost Distance parameter

I am looking to create a sql expression regarding point feature class and selection based on 'Name' field to pass to arcpy.sa.CostDistance() param[0]. similat to: savepath = env.workspace = ...
0
votes
0answers
71 views

How do I use Arcpy to label based on two different expressions, then convert to annotation?

I am trying to open an mxd and turn on labels before converting them to annotation. I would like to turn on labels with 2 different classes, based on 2 different expressions, then convert them to 1 ...
0
votes
1answer
61 views

How to create SQL statement to only return chainage values every 500m?

I have a list of chainage values every 100m (as a whole number) and I am trying to create an SQL statement to only return values every 500m. Any ideas? Using ArcGIS 10.1
2
votes
1answer
76 views

Conditional SQL Query

I've been running a code that searches a desired field in a feature class and performs an specified SQL query based on whether the field is string or double. The variables are just temporary fillers ...
1
vote
1answer
73 views

SQL within Python Script to get only part of the expression by GetParameterAsText

I was wondering if anybody could help me. Im trying to create a tool within ArcMap using a python script. Within the script i've been trying figure out how to change it so that I only need to get ...
1
vote
0answers
96 views

PyQGIS Dialog Plugin not resetting

I have written a PostGIS search plugin that works pretty well, except two things that I just cannot figure out a solution 1) When the dialog closes and then is reopened the previous query is still in ...
1
vote
0answers
37 views

Is it possible to retrieve lost versioned data in SQL Server Management Studio?

One of my staff accidentally deleted a feature class she was creating in her version before I reconciled it. I have grabbed a back up of the database from yesterday in SQL Management Studio. Is ...
0
votes
2answers
45 views

How can I optimize this point-linking query?

I have the following query, and am wondering how it could be optimised to run faster: WITH gps_nodes_1 AS ( SELECT "NODE_ID", "geog" FROM gps_nodes WHERE ST_Distance("geog",ST_GeogFromText('POINT( ...
0
votes
1answer
46 views

Set ArcGIS Tool Parameter to Obtain From it's own Source?

I am building a python tool in ArcGIS. When I build the parameters I will have 3: Choose a shapefile (parameter data type = shapefile) Choose an SQL query (parameter data type = SQL Expression) ...
1
vote
1answer
35 views

How to refer to a variable from the conditional statement in the ExtractByAttributes function in ArcGIS 10?

Trying to use the ExtractByAttributes for rasters so that I have multiple attribute values that I want to extract. This works fine: myraster = arcpy.sa.ExtractByAttributes("source_raster", "VALUE IN ...
2
votes
1answer
287 views

is there any direct access to Mapbox data? (similar to CartoDB's sql api)

I've been asked to add a form to a map that will write data in the background (e.g., ajax to a magic file that does datawrites and some emailing, notifications etc) and a new marker will be added to ...
0
votes
1answer
44 views

How can I combine two datasets with the same schema in to one table?

So I have two tables (in CartoDB/PostGIS) that are from two tiger shapefiles that have the exact same attributes, just in different counties. I want to combine them in to a single table, just ...
2
votes
1answer
501 views

Cartodb - SQL query of public visualization of a private table

The team at CartoDB have recently(last few days) made some useful updates that now allow public visualisation maps to reference data in private tables. The change has only been made in the last day ...
0
votes
1answer
168 views

How can I show numbers as percentages in CartoDB?

I would like to format numbers as percentages in cartodb. What are the best functions to display numbers with decimals, comma separators or percenteges? Thanks
0
votes
0answers
82 views

Group Nearest neighbor query in SQL Server 2012 spatial database

I am looking for way to perform GNN query over road networks in SQL Server. Any pointers
0
votes
1answer
28 views

Flag More Than One Space in SQL

I am working on an XP machine with FME'13 and I have a Address field and I have to find the spaces(middle spaces and not the leading and trailing ) in each and every row. St._Petters_Road is the ...
-1
votes
4answers
882 views

What is a SQL Query to all values in a column with Select by Attribute in ArcGIS? [closed]

I would like to select all values for an attribute using select layer by attribute to use in model builder and hopefully save the expression for automation purposes. If I have an attribute named ...
0
votes
1answer
208 views

How do I query XY Event Layer in Model Builder?

I am trying to build a model to input table data, make xy event layer and then select features by an SQL expression and make that a shapefile. What tool should I use for the SQL expression to select ...
1
vote
3answers
198 views

How do I use SQL in the field calculator to populate a new column?

Courtesy of Geofabrik I have a "places" point shapefile which includes in the attribute table a column named "type". As can be seen in the attached image the column contains fields such as "city", ...
1
vote
1answer
80 views

MSSQL server 2008 dissolve sql query

I have a set of spatial objects in a MSSQL server 2008 R2 trying to dissolve adjoining objects where one of the attributes are equal. The table below is somewhat representative to my original table: ...
0
votes
0answers
20 views

GeoDatabase user access based on administration boundry

I have silverlight application consuming Map service. Now I want to create user login. The scenarion is somethinkg like when a user logs he should only be able to query on data belongs to his area. ...
0
votes
2answers
56 views

sql query to get origins and destinations

I have a table of cities with an ID and geometry (200K rows) and a table of travels, with only two ID: idfrom, idto (7K rows) I'm wondering how could I select the geometries for each one in order to ...
1
vote
2answers
122 views

How can I create a hexbin layer using the SQL and CartoCSS parameters in cartodb.js?

CartoDB has a great hexbin visualization wizard baked into the client dashboard: However, I like using cartodb.js to customize events and interactions; in particular, I'd like to make styles ...
-1
votes
1answer
179 views

Shortest Path Dijkstra

I would like to calculate the shortest path with dijkstra algorithm. sample query SELECT seq, id1 AS node, id2 AS edge, cost FROM pgr_dijkstra(' SELECT gid AS id, ...
0
votes
1answer
96 views

How to cut/split multipolygon with blade (linestring) into two pieces using PostGIS? [closed]

I struggle to do split operation in postgis I tried to build a query but Im always fail. Id like to cut a multipoligon with a blade (a linestring) into two pieces. These two objects have specific ...
1
vote
1answer
60 views

Rewrite query to match two points with a linestring in a different database table

OK, not sure if I've worded the title brilliantly, but here goes: Suppose I have: a table "gps_nodes" containing columns: "EASTING" (containing longitude data) "NORTHING" (containing latitude ...