Query the Data Delivery Network
Query the DDNThe easiest way to query any data on Splitgraph is via the "Data Delivery Network" (DDN). The DDN is a single endpoint that speaks the PostgreSQL wire protocol. Any Splitgraph user can connect to it at data.splitgraph.com:5432 and query any version of over 40,000 datasets that are hosted or proxied by Splitgraph.
For example, you can query the drones_edmonton_insight_community table in this repository, by referencing it like:
"edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latest"."drones_edmonton_insight_community"or in a full query, like:
SELECT
":id", -- Socrata column ID
"age_rollup_detailed_study_profiling_questionnaire_2014", -- Profiling question, Based on birthdate entered by Respondent. System Determined. Question: Age Rollup? - || Possible Answers: Under 15/15-17/18-24/25-29/30-34/35-39/40-44/45-49/50-54/55-59/60-64/65-69/70-74/75-79/80 and over
"fsa_study_profiling_questionnaire_2014", -- Forward Sortation Area (first 3 characters of postal code)
"q15_household_income_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Which of the following categories best describes your total household income in 2014 before taxes? || Possible Answers: Under $20,000/$20,000 to $29,999/$30,000 to $39,999/$40,000 to $49,999/$50,000 to $59,999/$60,000 to $79,999/$80,000 to $99,999/$100,000 to $149,000/$150,000 and over/Prefer not to answer
"q14a_primary_transportation_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - What is your primary mode of transportation? || Possible Answers: Car/truck/Van as DRIVER/Car/truck/van as PASSENGER/Public Transit/Walk/Bicycle/Other (Specify)
"q18_dronecoebylaws", -- Respondents were asked to select one response. Question: - The Transport Canada regulations indicate that the City must give permission for UAV/drone flights over City-owned property. The City has the ability to deny access, as part of the required Transport Canada approval process. In your opinion, should the City use bylaws to restrict some uses of UAV/drones in order to control noise, promote safety and help protect the privacy of Edmontonians?? || Possible Answers: The City should restrict some usage/The City should not restrict usage/I don't know without more information
"q17_droneagreescale_uav_drone_use_by_private_individuals_and_or", -- Respondents were asked to rank the following on a scale. Question: UAV/Drone use by private individuals and organizations such as news media and construction firms should not be limited by City bylaws.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"completiondate", -- Date/Time the respondent finished the survey.
"responsedate", -- Date/Time the respondent first opened/started the survey.
"q17_droneagreescale_i_have_safety_concerns_regarding_drones_000", -- Respondents were asked to rank the following on a scale. Question: I have safety concerns regarding drones flying over property.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"q16_education_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - What is the highest level of education you have completed? || Possible Answers: Elementary/grade school graduate/High school graduate/College / technical school graduate/University undergraduate degree/Post-graduate degree/Professional school graduate (e.g. medicine, dentistry, veterinary medicine, optometry)
"q11_home_language_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - What is the primary language spoken in your household? || Possible Answers: English/Arabic/Cantonese/Spanish/Panjabi (Punjabi)/French/German/Mandarin/Tagalog (Pilipino, Filipino)/Ukrainian/Other (Specify)
"gender_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Are you…? || Possible Answers: Male/Female/Other/I prefer not to answer
"browsertype", -- System Captured, Browser used by the respondent. Question: Browser Type? - BrowserType || Possible Answers: Internet Explorer/Firefox/Safari/Google Chrome/Opera/Android/BlackBerry/Unknown
"ostype", -- System Captured, OS used by the respondent. Question: OS Type? - OSType || Possible Answers: Mac (OS X)/Linux/Windows/iOS/Android/BlackBerry/Unknown
"q14_droneown", -- Respondents were asked to select one response. Question: - Source: Creative CommonsAircraft without a pilot on board go by many names—unmanned air vehicle (UAV), remotely piloted aircraft system, model aircraft, remote control aircraft, and drone.Do you or someone in your household own a unmanned aircraft vehicles (drone)?? || Possible Answers: Yes/No/Don't know
"q17_city_employee_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Do you work for the City of Edmonton? || Possible Answers: Yes/No
"devicetype", -- System Captured, Device used by the respondent. Question: Device Type? - DeviceType || Possible Answers: Tablet/Desktop/Phone
"q17_droneagreescale_unrestricted_use_will_cause_an_invasion_of_", -- Respondents were asked to rank the following on a scale. Question: Unrestricted use will cause an invasion of privacy.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"q13_volunteer_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - In the last 12 months, did you do any activities without pay on behalf of a group or an organization as a volunteer? || Possible Answers: Yes/No
"q16_droneedmreg", -- Respondents were asked to select one response. Question: - To the best of your knowledge who enforces the use of unmanned aircraft vehicles (UAV) or drones in Edmonton?? || Possible Answers: Transport Canada/City of Edmonton/Government of Alberta/Other: (specify)/I don't know
"q14a_droneown_photoenabled", -- Respondents were asked to select one response. Question: - Does the unmanned air vehicle or drone in your household have a camera attachment that is able to record video and take pictures?? || Possible Answers: Yes/No/Don't know
"q3_own_rent_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Do you own or rent your primary residence in the City of Edmonton? || Possible Answers: Own/Rent
"q12_employment_status_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - What is your current employment status? || Possible Answers: Employed full-time (30+ hours a week)/Employed part-time (0-30 hours a week)/Homemaker/Post-secondary student/High School Student/Unemployed/Permanently unable to Work/Retired/Other (Specify)
"q13_droneawareness", -- Respondents were asked to select one response. Question: - Are you familiar with recreational drones, also known as “unmanned aircraft vehicles (UAV)”?? || Possible Answers: Yes/No/Don't know
"q15_dronecanadianreg", -- Respondents were asked to select one response. Question: - To the best of your knowledge who regulates the use of unmanned aircraft vehicles (UAV) or drones in Canada?? || Possible Answers: Transport Canada/City of Edmonton/Government of Alberta/Other: (specify)/I don't know
"q17_droneagreescale_there_are_some_situations_where_use_of_uav_", -- Respondents were asked to rank the following on a scale. Question: There are some situations where use of UAV/drones should be restricted.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"q17_droneagreescale_i_have_safety_concerns_regarding_drones_001", -- Respondents were asked to rank the following on a scale. Question: I have safety concerns regarding drones flying over people.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"q14b_secondary_transportation_study_profiling_questionnaire_201", -- Profiling question, one response selected by respondent. - What is your secondary mode of transportation? || Possible Answers: Car/truck/Van as DRIVER/Car/truck/van as PASSENGER/Public Transit/Walk/Bicycle/Only have one mode of transportation/Other (Specify)
"q7_children_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Do you have children 18 or under living at home? || Possible Answers: Yes/No
"q17_droneagreescale_i_have_concerns_with_the_noise_uav_drones_c", -- Respondents were asked to rank the following on a scale. Question: I have concerns with the noise UAV/drones could create in residential areas or parks.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
"q8_born_canada_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Were you born in Canada? || Possible Answers: Yes/No
"q10_own_business_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Do you own a business in the City of Edmonton? || Possible Answers: Yes/No
"q9a_edmonton_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - How long have you lived in Edmonton? || Possible Answers: Less than 1 year/Between 1 to 2 years/Between 3 to 5 years/Greater than 5 years/I do not live in Edmonton
"q17_droneagreescale_uav_drone_use_should_have_some_restrictions" -- Respondents were asked to rank the following on a scale. Question: UAV/Drone use should have some restrictions due to safety concerns.? || Possible Answers: 5 Strongly Agree/4 Somewhat Agree/3 Neither Agree nor Disagree/2 Somewhat Disagree/1 Strongly Disagree/Don't Know
FROM
"edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latest"."drones_edmonton_insight_community"
LIMIT 100;Connecting to the DDN is easy. All you need is an existing SQL client that can connect to Postgres. As long as you have a SQL client ready, you'll be able to query edmonton-ca/drones-edmonton-insight-community-r7s9-vh96 with SQL in under 60 seconds.
Query Your Local Engine
bash -c "$(curl -sL https://github.com/splitgraph/splitgraph/releases/latest/download/install.sh)"Read the installation docs.
Splitgraph Cloud is built around Splitgraph Core (GitHub), which includes a local Splitgraph Engine packaged as a Docker image. Splitgraph Cloud is basically a scaled-up version of that local Engine. When you query the Data Delivery Network or the REST API, we mount the relevant datasets in an Engine on our servers and execute your query on it.
It's possible to run this engine locally. You'll need a Mac, Windows or Linux system to install sgr, and a Docker installation to run the engine. You don't need to know how to actually use Docker; sgrcan manage the image, container and volume for you.
There are a few ways to ingest data into the local engine.
For external repositories, the Splitgraph Engine can "mount" upstream data sources by using sgr mount. This feature is built around Postgres Foreign Data Wrappers (FDW). You can write custom "mount handlers" for any upstream data source. For an example, we blogged about making a custom mount handler for HackerNews stories.
For hosted datasets (like this repository), where the author has pushed Splitgraph Images to the repository, you can "clone" and/or "checkout" the data using sgr cloneand sgr checkout.
Cloning Data
Because edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latest is a Splitgraph Image, you can clone the data from Spltgraph Cloud to your local engine, where you can query it like any other Postgres database, using any of your existing tools.
First, install Splitgraph if you haven't already.
Clone the metadata with sgr clone
This will be quick, and does not download the actual data.
sgr clone edmonton-ca/drones-edmonton-insight-community-r7s9-vh96Checkout the data
Once you've cloned the data, you need to "checkout" the tag that you want. For example, to checkout the latest tag:
sgr checkout edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latestThis will download all the objects for the latest tag of edmonton-ca/drones-edmonton-insight-community-r7s9-vh96 and load them into the Splitgraph Engine. Depending on your connection speed and the size of the data, you will need to wait for the checkout to complete. Once it's complete, you will be able to query the data like you would any other Postgres database.
Alternatively, use "layered checkout" to avoid downloading all the data
The data in edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latest is 0 bytes. If this is too big to download all at once, or perhaps you only need to query a subset of it, you can use a layered checkout.:
sgr checkout --layered edmonton-ca/drones-edmonton-insight-community-r7s9-vh96:latestThis will not download all the data, but it will create a schema comprised of foreign tables, that you can query as you would any other data. Splitgraph will lazily download the required objects as you query the data. In some cases, this might be faster or more efficient than a regular checkout.
Read the layered querying documentation to learn about when and why you might want to use layered queries.
Query the data with your existing tools
Once you've loaded the data into your local Splitgraph Engine, you can query it with any of your existing tools. As far as they're concerned, edmonton-ca/drones-edmonton-insight-community-r7s9-vh96 is just another Postgres schema.