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 managed_care_regional_consumer_guide table in this repository, by referencing it like:
"health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep:latest"."managed_care_regional_consumer_guide"or in a full query, like:
SELECT
":id", -- Socrata column ID
"domain_rating", -- A health plan’s rating for higher domain ratings or sub domain ratings.
"payer", -- Type of insurance.
"measure", -- Measure short name from the QARR dataset.
"measurement_year", -- Year that the data for the measure rate and consumer guide rating were collected.
"report_year", -- Year that the measure rate and consumer guide ratings were reported.
"plan_name", -- The name of the health plan.
"plan_id", -- The health plan’s unique identifier used in QARR.
"mean_of_total_stars", -- The mean calculated based on based on the total stars from all the plans in the same type of insurance
"critical_value", -- The critical value associated with each measure based on the method of collection for that measure
"total_stars", -- A plan’s total star is calculated by adding up all the domain ratings/stars for that plan
"domain_scores", -- A domain score for a plan is the average of the standardized measure scores within the domain for that plan
"average_critical_value", -- Average critical value for a domain
"cg_domain", -- Consumer guide sub domains. The sub domains represents quality of care for a given set of measures from health plans.
"sub_domain", -- Sub domain in the QARR dataset that the measure is associated with.
"standard_deviation_of_domain_scores", -- The standard deviation calculated based on the domain scores from all the plans in the same type of insurance
"region", -- Designated by DOH
"standard_deviation_of_total_stars", -- The standard deviation calculated based on the total stars from all the plans in the same type of insurance.
"cg_higher_domain", -- Consumer guide over-arching domains. These "higher" domains group the sub domains of care in the managed care consumer guide.
"measuredescription", -- Description of quality measure from the QARR dataset.
"mean_of_domain_scores", -- The mean calculated based on the domain scores from all the plans in the same type of insurance
"domain" -- Domain in the QARR dataset that the measure is associated with.
FROM
"health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep:latest"."managed_care_regional_consumer_guide"
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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep 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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep: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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uepCheckout 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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep:latestThis will download all the objects for the latest tag of health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep 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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep: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 health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep: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, health-data-ny-gov/managed-care-regional-consumer-guide-44t3-4uep is just another Postgres schema.