• acs 5-year estimates
  • american community survey
  • census tract
  • county
  • household type
  • + 2

Query the Data Delivery Network

Query the DDN

The 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 procotol. Any Splitgraph user can connect to it at and query any version of over 40,000 datasets that are hosted or proxied by Splitgraph.

For example, you can query the iowa_households_with_adults_65_years_and_over_by table in this repository, by referencing it like:


or in a full query, like:

    ":id", -- Socrata column ID
    "geography_id", -- Specific geography id used by the U.S. Census for the state, county, place or census tract associated with the record.
    "row_id", -- Unique Row Identifier
    "adult_65_years_or_older", -- Values include total, yes and no.  Total reflects all households regardless of the presence of an adult 65 years or older.  Yes are households with one or more adults 65 years or older.
    "value", -- A household includes all the persons who occupy a housing unit as their usual place of residence. A housing unit is a house, an apartment, a mobile home, a group of rooms, or a single room that is occupied as separate living quarters.  Values reported are associated with the applicable geography, variable and data collection period.
    "household_type", -- Household type includes: All Households Types, 1 Person Household, 2 or More Person Households, 2 or More Person Family Households and 2 or More Person Nonfamily Households.  A family household is a household maintained by a householder who is in a family.  A family group is defined as any two or more people residing together, and related by birth, marriage, or adoption.
    "date", -- The date when the 60 month data collection period concluded.
    "data_collection_period", -- The data collection period reflects the years associated with the 60 month data collection period.
    "variable_description", -- Describes the characteristics associated with the variable.
    "variable", -- Variable name identified by the US Census Bureau.
    "name", -- Name of geography associated with the record.
    "type", -- Specifies the type of geography associated with the record. Categories include: state, county, place and tract.
    "location", -- Primary point for the specific geography.
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 mydata-iowa-gov/iowa-households-with-adults-65-years-and-over-by-8zkb-s7x8 with SQL in under 60 seconds.

This repository is an "external" repository. That means it's hosted elsewhere, in this case at When you querymydata-iowa-gov/iowa-households-with-adults-65-years-and-over-by-8zkb-s7x8: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

Install Splitgraph Locally
bash -c "$(curl -sL"

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, 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 \
  "mydata-iowa-gov/iowa-households-with-adults-65-years-and-over-by-8zkb-s7x8" \
  --handler-options '{
    "domain": "",
    "tables": {
        "iowa_households_with_adults_65_years_and_over_by": "8zkb-s7x8"

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, mydata-iowa-gov/iowa-households-with-adults-65-years-and-over-by-8zkb-s7x8 is just another Postgres schema.

Related Documentation: