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 shelter_repair_scorecard table in this repository, by referencing it like:
"cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx:latest"."shelter_repair_scorecard"or in a full query, like:
SELECT
":id", -- Socrata column ID
"commissionerorder_closed_monthly_dohmh", -- DOHMH commissioner order violations closed during reporting period.
"highpriority_new_monthly_fdny", -- FDNY high priority violations created during reporting period.
"highpriority_closed_monthly_dohmh", -- DOHMH high priority violations closed during reporting period.
"highpriority_closed_monthly_fdny", -- FDNY high priority violations closed during reporting period.
"dhs_bld_id", -- DHS ID for shelter building.
"borough", -- Borough for building.
"commissionerorder_new_monthly_fdny", -- FDNY commissioner order violations created during reporting period.
"commissionerorder_new_monthly_dohmh", -- DOHMH commissioner order violations created during reporting period.
"lowestpriority_new_monthly_fdny", -- FDNY lowest priority violations created during reporting period.
"lowestpriority_closed_monthly_dohmh", -- DOHMH lowest priority violations closed during reporting period.
"commissionerorder_open_monthly_dob", -- DOB commissioner order violations open at end of reporting period.
"commissionerorder_new_monthly_dob", -- DOB commissioner order violations created during reporting period.
"lowestpriority_open_monthly_dob", -- DOB lowest priority violations open at end of reporting period.
"mediumpriority_new_monthly_fdny", -- FDNY medium priority violations created during reporting period.
"mediumpriority_new_monthly_dohmh", -- DOHMH medium priority violations created during reporting period.
"highpriority_new_monthly_dohmh", -- DOHMH high priority violations created during reporting period.
"mediumpriority_open_monthly_dob", -- DOB medium priority violations open at end of reporting period.
"mediumpriority_new_monthly_dob", -- DOB medium priority violations created during reporting period.
"mediumpriority_closed_monthly_fdny", -- FDNY medium priority violations closed during reporting period.
"commissionerorder_closed_monthly_dob", -- DOB commissioner order violations closed during reporting period.
"commissionerorder_new_monthly_hpd", -- HPD commissioner order violations created during reporting period.
"commissionerorder_closed_monthly_fdny", -- FDNY commissioner order violations closed during reporting period.
"landlord", -- Landlord for building.
"highpriority_new_monthly_dob", -- DOB high priority violations created during reporting period.
"mediumpriority_open_monthly_hpd", -- HPD medium priority violations open at end of reporting period.
"lowestpriority_closed_monthly_dob", -- DOB lowest priority violations closed during reporting period.
"lowestpriority_open_monthly_dohmh", -- DOHMH lowest priority violations open at end of reporting period.
"commissionerorder_open_monthly_hpd", -- HPD commissioner order violations open at end of reporting period.
"commissionerorder_closed_monthly_hpd", -- HPD commissioner order violations closed during reporting period.
"month", -- Month
"shelter_name_all", -- Name of shelter, shelter serivces provider, and shelter type. If more than one shelter operates in a building, all shelters are listed.
"highpriority_closed_monthly_dob", -- DOB high priority violations closed during reporting period.
"highpriority_open_monthly_dob", -- DOB high priority violations open at end of reporting period.
"highpriority_open_monthly_fdny", -- FDNY high priority violations open at end of reporting period.
"mediumpriority_closed_monthly_dob", -- DOB medium priority violations closed during reporting period.
"mediumpriority_new_monthly_hpd", -- HPD medium priority violations created during reporting period.
"mediumpriority_open_monthly_fdny", -- FDNY medium priority violations open at end of reporting period.
"mediumpriority_open_monthly_dohmh", -- DOHMH medium priority violations open at end of reporting period.
"lowestpriority_closed_monthly_hpd", -- HPD lowest priority violations closed during reporting period.
"lowestpriority_new_monthly_hpd", -- HPD lowest priority violations created during reporting period.
"lowestpriority_open_monthly_hpd", -- HPD lowest priority violations open at end of reporting period.
"lowestpriority_closed_monthly_fdny", -- FDNY lowest priority violations closed during reporting period.
"commissionerorder_open_monthly_fdny", -- FDNY commissioner order violations open at end of reporting period.
"highpriority_new_monthly_hpd", -- HPD high priority violations created during reporting period.
"lowestpriority_new_monthly_dohmh", -- DOHMH lowest priority violations created during reporting period.
"commissionerorder_open_monthly_dohmh", -- DOHMH commissioner order violations open at end of reporting period.
"facility_type", -- Categorization of shelter. Categories are based on contractual, service, and phyical structure characteristics. Options are Single Adult, (Single Adult) Veterans Short Term Housing, Outreach/Safe Haven, Family Tier II, Family Hotel, Family Clusters, (Family) Late Arrival, Adult Family Hotel, and Adult Family Tier II.
"capacity", -- Usable capacity of a shelter building for all shelter providers within a building. For family shelters, this is a count of family units (e.g.: apartments) that are available to house DHS clients. For adult shelters, this is a count of indivdiual beds.
"highpriority_closed_monthly_hpd", -- HPD high priority violations closed during reporting period.
"highpriority_open_monthly_hpd", -- HPD high priority violations open at end of reporting period.
"highpriority_open_monthly_dohmh", -- DOHMH high priority violations open at end of reporting period.
"mediumpriority_closed_monthly_hpd", -- HPD medium priority violations closed during reporting period.
"mediumpriority_closed_monthly_dohmh", -- DOHMH medium priority violations closed during reporting period.
"lowestpriority_new_monthly_dob", -- DOB lowest priority violations created during reporting period.
"lowestpriority_open_monthly_fdny" -- FDNY lowest priority violations open at end of reporting period.
FROM
"cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx:latest"."shelter_repair_scorecard"
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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx 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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx: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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yxCheckout 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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx:latestThis will download all the objects for the latest tag of cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx 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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx: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 cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx: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, cityofnewyork-us/shelter-repair-scorecard-dvaj-b7yx is just another Postgres schema.