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 media_releases_edmonton_insight_community table in this repository, by referencing it like:
"edmonton-ca/media-releases-edmonton-insight-community-6qc2-syqq:latest"."media_releases_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
"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
"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)
"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)
"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
"infodistribution_weekly_or_monthly_video_on_recent_decisions_an", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -weekly or monthly video on recent decisions and upcoming items in City Council || Possible Answers: Yes (1)/No (0)
"infodistribution_monthly_or_quarterly_e_newsletter_about_a_part", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -monthly or quarterly e-newsletter about a particular City service or area of City business || Possible Answers: Yes (1)/No (0)
"completiondate", -- Date/Time the respondent finished the survey.
"responsedate", -- Date/Time the respondent first opened/started the survey.
"fsa_study_profiling_questionnaire_2014", -- Forward Sortation Area (first 3 characters of postal code)
"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
"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)
"devicetype", -- System Captured, Device used by the respondent. Question: Device Type? - DeviceType || Possible Answers: Tablet/Desktop/Phone
"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
"infodistribution_other_form_of_information", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -other form of information || Possible Answers: Yes (1)/No (0)
"infodistribution_none_of_the_above", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -none of the above || Possible Answers: Yes (1)/No (0)
"infodistribution_weekly_email_about_upcoming_public_engagement_", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -weekly email about upcoming public engagement opportunities with the City || Possible Answers: Yes (1)/No (0)
"infodistribution_weekly_email_about_recently_made_decisions_of_", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -weekly email about recently made decisions of City Council || Possible Answers: Yes (1)/No (0)
"newsreleases", -- Respondents were asked to select one response. Question: - To start...Would you like to receive news releases from the City emailed to you at the same time they are sent to media?? || Possible Answers: Yes/No
"cityoffers_e_newsletters_about_several_city_services", -- Respondents were asked to select one response. Question: - e-newsletters about several City services? || Possible Answers: Yes/No
"cityoffers_an_email_service_for_anyone_to_receive_news_releases", -- Respondents were asked to select one response. Question: - an email service for anyone to receive news releases at http://www.edmonton.ca/news? || Possible Answers: Yes/No
"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)
"q8_born_canada_study_profiling_questionnaire_2014", -- Profiling question, one response selected by respondent. - Were you born in Canada? || 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
"infodistribution_weekly_or_monthly_podcast_on_recent_decisions_", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -weekly or monthly podcast on recent decisions and upcoming items in City Council || Possible Answers: Yes (1)/No (0)
"infodistribution_monthly_email_about_recently_made_decisions_of", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -monthly email about recently made decisions of City Council || Possible Answers: Yes (1)/No (0)
"infodistribution_weekly_email_about_items_coming_up_in_city_cou", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -weekly email about items coming up in City Council || Possible Answers: Yes (1)/No (0)
"infodistribution_monthly_email_about_upcoming_public_engagement", -- Respondents were asked to select all that apply. Question: Which of the following would you use if the City created the service: -monthly email about upcoming public engagement opportunities with the City || Possible Answers: Yes (1)/No (0)
"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
"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
"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
"gender_study_profiling_questionnaire_2014" -- Profiling question, one response selected by respondent. - Are you…? || Possible Answers: Male/Female/Other/I prefer not to answer
FROM
"edmonton-ca/media-releases-edmonton-insight-community-6qc2-syqq:latest"."media_releases_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/media-releases-edmonton-insight-community-6qc2-syqq 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/media-releases-edmonton-insight-community-6qc2-syqq: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/media-releases-edmonton-insight-community-6qc2-syqqCheckout 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/media-releases-edmonton-insight-community-6qc2-syqq:latestThis will download all the objects for the latest tag of edmonton-ca/media-releases-edmonton-insight-community-6qc2-syqq 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/media-releases-edmonton-insight-community-6qc2-syqq: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/media-releases-edmonton-insight-community-6qc2-syqq: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/media-releases-edmonton-insight-community-6qc2-syqq is just another Postgres schema.