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

learn more… | top users | synonyms

1
vote
0answers
38 views

CartoDB: how to let users update data from the map infowindow [closed]

In cartoDB, I have a map showing public lands in a German city. I want to integrate a form into the cartoDB infowindow to let the user update the data table. How can I pass the values from the form ...
3
votes
1answer
55 views

Data Insertion from .CSV file to a Feature Class attribute Table in ArcGIS for Desktop?

I am working on water network in ArcGIS 10.2. I am trying to insert data from a data.csv file to an existing feature class House Meter in personal GDB. One method I know to use is the join data.csv ...
0
votes
0answers
37 views

MAX value in SQL

I have used a variation of this sql statement successfully in the past but can't get it to work now. I have a table named "RS_Event_All_NE_25_Weekdays" in a personal geodatabase running on arcmap ...
2
votes
1answer
222 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 ...
0
votes
1answer
58 views

CartoDB - PostgreSQL row_number() using PostGIS ST_Distance

I'm currently working on a query that should return a subset (i.e. "new") CartoDB table sorted by proximity to a given point. I want to display labels on the map corresponding to the closest, second ...
2
votes
2answers
281 views

Query to find all lines connected to other

I have problem with one spatial (Oracle) query. Simplified overview of the problem is: I have two tables: CREATE TABLE thin_lines ( id NUMBER PRIMARY KEY, geom SDO_GEOMETRY), color ...
0
votes
0answers
41 views

SQL script for postgis column name with colon

I have an sql script that creates some tables from the default planet_osm_point, planet_osm_line, planet_osm_polygon tables which are created with the osm2pgsql command line tool. DROP TABLE IF ...
1
vote
1answer
36 views

Cartodb sql not executing

I am a beginner, learning the cartodb-API. below is my javascript code which is below my body tag in the HTML page. The map, together with the points are loading correctly but the SQL command is not ...
0
votes
1answer
45 views

PostGIS Query Geometry Field Truncated

Some of the geometry fields that are returned from my PostGIS queries are truncated. When I first found this error any geometry fields with more than a few thousand characters would not show up in the ...
1
vote
2answers
76 views

Finding values that are different between two tables in MapInfo/MapBasic based on a unique ID

I am comparing 2 tables which are mostly the same but there have been some amendments, in effect comparing a new version to the old one and displaying all the records with changes in a selection table ...
3
votes
1answer
53 views

SQL check if first value in line is number

In the layer definition query in ArcGIS 10.4 I want to only use objects that look like 1/12 Main Street 12-2 Side Street etc and not ones that have Main Street Side Street Is this possible? So ...
4
votes
2answers
227 views

Correct SQL expression when looping different fields

I'm having trouble with the follow lines of code. Practically what I am doing is a 10 shapefile loop in which field represents the name of the field that I want to be calculated( the name differs by ...
1
vote
1answer
268 views

Querying Oracle geometry data type

How to query or find the geometry data type a given Oracle Database is using in SQL Developer (i.e. SDO_Geometry, ST_Geometry, etc)? I thought I could just describe a feature class within the ...
1
vote
1answer
40 views

Loop through a list and concatenate a string in Arcpy

I'm making a program where the user enters some codes (GetParameterAsText) that are going to be used in a SQL expression to select by atributes. I tried to find similar topics but didn't find a ...
2
votes
1answer
27 views

How to get Cartodb.js to use https?

I have a simple SQL query from my Cartodb account to populate a chart. Here is the link The chart works fine outside my company on a public network but I keep getting the following error when ...
2
votes
1answer
48 views

Renaming a table in the QGIS DB Manager

When creating a PostGIS table (e.g. 'lakes') in the DB Manger a primary key ('lakes_pkey'), a index ('sidx_lakes_geom) and a sequence ('lakes_gid_seq') are also created. But when renaming the table ...
3
votes
2answers
367 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 ...
2
votes
2answers
43 views

How many query points fall within distance X to a set of LineString

I have a set of 10 query points and I want to know how many of them are with distance within at most 4 meters of any LineString in a given table. Note that if a point is within 4 meter distance to ...
1
vote
0answers
45 views

How do I create an attribute table in a web page from GeoServer using JavaScript?

I'm trying to create a custom web application using Leaflet and Geoserver. I've got my layers visible in a map viewer, but I'd also like to show an attribute table of the visible map layers. I can't ...
0
votes
1answer
59 views

Select Layer By Attribute: SQL Expression using ArcGIS ModelBuilder?

I am currently using ArcMap 10.3's ModelBuilder. Having created a feature class of 300 zones, I would like to filter these to the 15 zones above 200 hectares in size, the model is shown below: I ...
2
votes
1answer
39 views

How to update a timestamp in SQL?

I've explored this forum fairly extensively trying to get answers as to why my SQL isn't working. I need help with the timestamp on a torque map. I've used the following formula, obviously changing ...
2
votes
0answers
27 views

Write userID to field automatically every time an object is edited

Currently every user has to put his/her useriD in a field after every change made to an object in the database. This takes time and can be forgotten easily. Is there a SQL-Command giving back the ...
8
votes
3answers
3k views

Label points at regular intervals using ArcGIS for Desktop?

I'm working with lines on roads represented by a large number of sequencial points. Since labeling all of them would make the points impossible to identify, I'd like to know if there is a way to label ...
7
votes
1answer
151 views

Join by attribute / spatialite with SQL / left outer join in QGIS

I have a layer with polygons (let's call it "woods") that is intersected by "n" line-objects ("roads"). Every road has an unique attribute roadid. I need to add ALL the roadid's (not only the first ...
3
votes
2answers
43 views

replace records in layer with records form another layer by id and column name QGIS

I have a two polyline layers - one with 2800 rows, the other with 150 rows. Each row has a unique id column. I need to replace the records in one column of the the 2800-row layer with the records ...
-2
votes
1answer
42 views

How much RAM do I need per SDE DB [closed]

Estimating RAM required is never a fixed number. However, there are base figures to follow for example for arcgis server services. How much RAM do I need to plan per DB? I'm using SQL Server but ...
4
votes
2answers
141 views

In terms of SQL, what exactly is Query Layer's “Unique Identifier” doing?

When you make a link with a database using Query Layer in ArcMap, you must select a Unique Identifier, which ensures that the resulting Layer only has unique records in the Attribute table. In some ...
5
votes
2answers
1k views

How to run custom queries on vector layers and display results?

Is there a way to display the result of a query in QGIS? For instance : To get the total number of inhabitants : SELECT SUM( inhabitants ) FROM countries To get the total density : SELECT ...
0
votes
0answers
20 views

Null output from Transform function of Spatialite

I am using Spatialite, an extension of SQlite and I have some problems running the transform function. According to the Spatialite functions page ...
3
votes
1answer
250 views

Running PostGIS ST_ClusterWithin on large dataset?

I am trying to use the new ST_ClusterWithin in PostGIS 2.2 to help me aggregate building polygons that are within 5 metres. The source data has > 13million polygons. I ran the following query on a ...
3
votes
1answer
38 views

How to replace a directory using QGIS Field calculator?

I have a column called Hotlink full of incorrect directories and I need to edit them. They currently read C:/ABCD/filename.pdf and I want them to read C:/Maps/ABCD/ABCD/filename.pdf The script I'm ...
2
votes
0answers
42 views

Using Make Query Table to join featureclass with table using 2 fields

I would like to join a forest density table to a forest ownership featureclass in a geodatabase based on two columns in each (TPO_Owner and County_Nm) so I can populate the Density column in the ...
1
vote
1answer
29 views

Selecting the minimum point in a polygon

I am attempting to find the minimum point value within a polygon using ArcGIS 10.3. I have two datasets: 1) A series of polygons & 2) A series of points scattered about. After selecting a given ...
2
votes
1answer
810 views

Spatial joining syntax

A standard PostGIS point-in-polygon query might look like this. (example tutorial) SELECT p.*,b.polyname FROM points p, shapes s WHERE ST_Within(p.the_geom,s.the_geom) Imagine this was not a ...
3
votes
2answers
2k views

Deleting records from multiple, similar feature classes by attribute values using SQL statement in ArcGIS Desktop?

I have several hundred geodatabase feature classes which all have the exact same fields. I need to go through each of those feature classes and delete any records which match an SQL query (the same ...
2
votes
4answers
2k views

Finding center point of MULTILINESTRING using PostGIS?

How to find the center point of MULTILINESTRING, which lies on the multiline? I am using SQL in PostGIS
2
votes
0answers
47 views

How can I convert a shapefile from a single line segment to separate side segments using PostGIS?

I have a shapefile (STC) which is a single line segment per street with information for both the odd and even sides of the street. This .shp file has to be converted to separate side segments. To do ...
31
votes
11answers
18k views

How to connect to PostGIS database from ArcMap?

How can I connect to a PostGIS database from ArcMap? Solutions for ArcGIS 9.3, 10.0 and later are acceptable. Ideally, I would like to be able to perform spatially enabled queries and receive the ...
1
vote
0answers
23 views

Subset of spatial data causes slow SQL Spatial STIntersects

I've been having an issue were a specific subset of data causes an SQL spatial intersect to run extremely slowly. I am running sets of 1000 points against a subset of polygon layer to be intersected. ...
2
votes
1answer
67 views

Creating SpatiaLite View in QGIS?

Using these instructions (there are several other examples to find, all look the same and all of them seem to work) http://www.gaia-gis.it/gaia-sins/spatialite-cookbook/html/sp-view.html "Hand-writing ...
2
votes
3answers
2k views

Spatial join versus classical join

What are the main differences between a spatial join and a classical database join such as an equi (inner) join?
1
vote
1answer
177 views

SQL query works in PostgreSQL but not in GeoServer SQL View

I can't find a solution for this problem after a couple of hours of research. The query is: SELECT searchaddress('some string'); FETCH ALL IN mycursor; The function searchaddress returns a ...
1
vote
0answers
44 views

How to access a feature by specific field value using python ogr in an efficient way?

I have one point layer and one polygon layer with a common identifier attribute field called "N", same objects amounts but Feature IDs (FID) are different. I have to iterate on the first one and what ...
6
votes
2answers
193 views

How can I cluster all points in a postgis table together based on their distance from each other?

I have a PostGIS (in postgres 9.3) table which has Points. I want to figure out the "clusters" in the data. If 2 points are < X distance apart, they should be added to a cluster, and this should be ...
1
vote
1answer
30 views

PostGIS update statement returns wrong information

I have two tables in postgis with polygon data. Both are in wgs84. I want to update a column (column1) in the one table (table1) with information from a column (column2) in the other table (table2), ...
0
votes
0answers
120 views

Convert XY to Lat Long using SQL?

My organization is creating a 311 mobile app. The backend is all run through SQL and report emails are generated. We are grabbing the xy from the app and then want to translate it to Lat/Long to be ...
1
vote
0answers
36 views

How to transfer SQL variable back into ArcPy script?

I am trying to teach myself to access sql tables from an ArcPy script as part of a larger QC process. I am fairly certain that I have the sql statement correct (it works in SQL Server, albeit ...
2
votes
2answers
3k 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 ...
6
votes
3answers
98 views

Select all polygons that are completely within a circular buffer

I made several buffers around some points. Now I want to select all polygons that are completely within this buffer. My problem is that I also get the polygons that are partially outside of the ...
5
votes
2answers
8k 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 | ...