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 canada_150_edmonton_insight_community table in this repository, by referencing it like:
"edmonton-ca/canada-150-edmonton-insight-community-gywn-ipg9:latest"."canada_150_edmonton_insight_community"or in a full query, like:
SELECT
":id", -- Socrata column ID
"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)
"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
"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)
"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)
"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
"q8_born_canada_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Were you born in Canada? Possible Answers: Yes/No
"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
"q5_canada150_other", -- If response to Q4_Canada150 is Yes or Maybe. Respondents were asked to select all responses that only. Question: If you wanted to plan a Canada 150 celebration, what of the following resources would be most helpful to you - Other - [ ]. Possible Answers: Yes (1)/No (0) The free text description is not included in the data.
"q5_canada150_funding_e_g_project_or_event_grants_in_kind_sponso", -- If response to Q4_Canada150 is Yes or Maybe. Respondents were asked to select all responses that only. Question: If you wanted to plan a Canada 150 celebration, what of the following resources would be most helpful to you - Funding (e.g. project or event grants, in-kind, sponsorships). Possible Answers: Yes (1)/No (0)
"q3_canada150", -- Respondents were asked to select one response only. Question: Of the themes noted below, which do you think is the most important for Edmonton to focus on for Canada 150 activities? Possible Answers: -Diversity and Inclusion (multicultural focus) -Reconciliation (Aboriginal focus) -Youth (leadership focus) -Environment (stewardship focus) -Celebration Events (leisure and entertainment focus) -Edmonton shouldn’t focus on Canada 150 activities
"q2_canada150", -- Respondents were asked to select one response only. Question: What type of project do you think Edmonton should recognize most for Canada’s 150th Anniversary? Possible Answers: -Capital Projects (e.g. public facilities and amenities such as community centres, park spaces, playgrounds, bike paths, sports fields) -Cultural Projects (e.g. artwork, exhibits, documentary films, theatrical or musical performances) -Social Projects (e.g. food security and poverty, homelessness, youth engagement and empowerment) -Environmental Projects (tree planting, energy efficiency) -Other (please specify) -None of the above The free text description is not included in the data.
"q1_canada150_celebrations_in_your_neighbourhood_e_g_community_l", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Celebrations in Your Neighbourhood (e.g. Community League BBQ, China Town Night Market) Possible Answers: Yes (1)/No (0)
"q1_canada150_educational_activities_events_and_exhibits_e_g_tel", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Educational Activities, Events and Exhibits (e.g. Telus World of Science, Edmonton Public Library, Museums) Possible Answers: Yes (1)/No (0)
"q1_canada150_tours_cultural_historical_and_environmental_e_g_wa", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Tours- cultural, historical, and environmental (e.g. Walk Through Time- Cemetery or historic sites tour, Eco-Solar Tour) Possible Answers: Yes (1)/No (0)
"q1_canada150_sports_activities_and_events_e_g_canada_day_road_r", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Sports Activities and Events (e.g. Canada Day Road Race) Possible Answers: Yes (1)/No (0)
"q1_canada150_festivals_and_events_large_scale_city_wide_focus_e", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Festivals and Events - large scale, city-wide focus (e.g. Canada Day at City Hall) Possible Answers: Yes (1)/No (0)
"completiondate", -- Date/Time the respondent finished the survey.
"responsedate", -- Date/Time the respondent first opened/started the survey.
"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
"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)
"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
"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)
"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
"q4_canada150", -- Respondents were asked to select one response only. Question: Will you be involved in planning any Canada 150 celebration activities? Possible Answers: -Yes -No -Maybe
"q1_canada150_i_wouldn_t_attend_any_canada_150_events", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? I wouldn’t attend any Canada 150 events Possible Answers: Yes (1)/No (0)
"q1_canada150_other_please_specify", -- Respondents were asked to select all that apply. Question: What Canada 150 celebratory activities or events would you like to attend if they were offered? Other (please specify) Possible Answers: Yes (1)/No (0) The free text description is not included in the data.
"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/Prefer not to say
"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
"devicetype", -- System Captured, Device used by the respondent. Question: Device Type? - DeviceType Possible Answers: Tablet/Desktop/Phone
"ostype", -- System Captured, OS used by the respondent. Question: OS Type? - OSType Possible Answers: Mac (OS X)/Linux/Windows/iOS/Android/BlackBerry/Unknown
"q5_canada150_networking_sessions_e_g_with_individuals_community", -- If response to Q4_Canada150 is Yes or Maybe. Respondents were asked to select all responses that only. Question: If you wanted to plan a Canada 150 celebration, what of the following resources would be most helpful to you - Networking sessions (e.g. with individuals, community organizations and/or businesses). Possible Answers: Yes (1)/No (0)
"q5_canada150_how_to_workshops_e_g_planning_special_events_build", -- If response to Q4_Canada150 is Yes or Maybe. Respondents were asked to select all responses that only. Question: If you wanted to plan a Canada 150 celebration, what of the following resources would be most helpful to you - “How to” Workshops (e.g. planning special events, building partnerships, proposal writing). Possible Answers: Yes (1)/No (0)
"fsa_study_profiling_questionnaire_2014", -- Forward Sortation Area (first 3 characters of postal code)
"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
"q5_canada150_celebration_kits_e_g_promotional_items_such_as_ban" -- If response to Q4_Canada150 is Yes or Maybe. Respondents were asked to select all responses that only. Question: If you wanted to plan a Canada 150 celebration, what of the following resources would be most helpful to you - Celebration Kits (e.g. promotional items such as banners, flags, logos, tattoos). Possible Answers: Yes (1)/No (0)
FROM
"edmonton-ca/canada-150-edmonton-insight-community-gywn-ipg9:latest"."canada_150_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/canada-150-edmonton-insight-community-gywn-ipg9 with SQL in under 60 seconds.
This repository is an "external" repository. That means it's hosted elsewhere, in this case at data.edmonton.ca. When you queryedmonton-ca/canada-150-edmonton-insight-community-gywn-ipg9:latest on the DDN, we "mount" the repository using the socrata mount handler. The mount handler proxies your SQL query to the upstream data source, translating it from SQL to the relevant language (in this case SoQL).
We also cache query responses on the DDN, but we run the DDN on multiple nodes so a CACHE_HIT is only guaranteed for subsequent queries that land on the same node.
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 (like this repository), 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, where the author has pushed Splitgraph Images to the repository, you can "clone" and/or "checkout" the data using sgr cloneand sgr checkout.
Mounting Data
This repository is an external repository. It's not hosted by Splitgraph. It is hosted by data.edmonton.ca, and Splitgraph indexes it. This means it is not an actual Splitgraph image, so you cannot use sgr clone to get the data. Instead, you can use the socrata adapter with the sgr mount command. Then, if you want, you can import the data and turn it into a Splitgraph image that others can clone.
First, install Splitgraph if you haven't already.
Mount the table with sgr mount
sgr mount socrata \
"edmonton-ca/canada-150-edmonton-insight-community-gywn-ipg9" \
--handler-options '{
"domain": "data.edmonton.ca",
"tables": {
"canada_150_edmonton_insight_community": "gywn-ipg9"
}
}'That's it! Now you can query the data in the mounted table like any other Postgres table.
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/canada-150-edmonton-insight-community-gywn-ipg9 is just another Postgres schema.