cityofchicago/traffic-crashes-vehicles-68nd-jvt3
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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 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 traffic_crashes_vehicles table in this repository, by referencing it like:

"cityofchicago/traffic-crashes-vehicles-68nd-jvt3:latest"."traffic_crashes_vehicles"

or in a full query, like:

SELECT
    ":id", -- Socrata column ID
    "area_04_i",
    "vehicle_id",
    "towed_by", -- Entity that towed the unit, if relevant
    "trailer1_length",
    "total_vehicle_length",
    "towed_to", -- Location to which the unit was towed, if relevant
    "hazmat_present_i",
    "num_passengers", -- Number of passengers in the vehicle. The driver is not included. More information on passengers is in the People dataset.
    "cmv_id",
    "ilcc_no",
    "carrier_state",
    "un_no",
    "crash_unit_id", -- A unique identifier for each vehicle record.
    "trailer2_length",
    "axle_cnt",
    "model", -- The model of the vehicle, if relevant
    "area_03_i",
    "wide_load_i",
    "area_07_i",
    "area_02_i",
    "mcs_report_i",
    "make", -- The make (brand) of the vehicle, if relevant
    "vehicle_use", -- The normal use of the vehicle, if relevant
    "maneuver", -- The action the unit was taking prior to the crash, as determined by the reporting officer
    "area_09_i",
    "first_contact_point",
    "idot_permit_no",
    "load_type",
    "cargo_body_type",
    "mcs_vio_cause_crash_i",
    "gvwr",
    "commercial_src",
    "mcs_report_no",
    "usdot_no",
    "hazmat_name",
    "hazmat_placards_i",
    "cmrc_veh_i",
    "area_12_i",
    "hazmat_report_i",
    "vehicle_config",
    "area_10_i",
    "hazmat_class",
    "unit_type", -- The type of unit
    "towed_i", -- Indicator of whether the vehicle was towed
    "area_05_i",
    "trailer2_width",
    "area_00_i",
    "mcs_out_of_service_i",
    "crash_record_id", -- This number can be used to link to the same crash in the Crashes and People datasets. This number also serves as a unique ID in the Crashes dataset.
    "hazmat_vio_cause_crash_i",
    "exceed_speed_limit_i", -- Indicator of whether the unit was speeding, as determined by the reporting officer
    "trailer1_width",
    "travel_direction", -- The direction in which the unit was traveling prior to the crash, as determined by the reporting officer
    "hazmat_out_of_service_i",
    "fire_i",
    "occupant_cnt", -- The number of people in the unit, as determined by the reporting officer
    "area_08_i",
    "ccmc_no",
    "area_06_i",
    "area_11_i",
    "hazmat_report_no",
    "carrier_name",
    "vehicle_defect",
    "vehicle_type", -- The type of vehicle, if relevant
    "vehicle_year", -- The model year of the vehicle, if relevant
    "lic_plate_state", -- The state issuing the license plate of the vehicle, if relevant
    "crash_date", -- Date and time of crash as entered by the reporting officer
    "area_01_i",
    "area_99_i",
    "carrier_city",
    "unit_no" -- A unique ID for each unit within a specific crash report.
FROM
    "cityofchicago/traffic-crashes-vehicles-68nd-jvt3:latest"."traffic_crashes_vehicles"
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 cityofchicago/traffic-crashes-vehicles-68nd-jvt3 with SQL in under 60 seconds.

This repository is an "external" repository. That means it's hosted elsewhere, in this case at data.cityofchicago.org. When you querycityofchicago/traffic-crashes-vehicles-68nd-jvt3: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 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.cityofchicago.org, 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 \
  "cityofchicago/traffic-crashes-vehicles-68nd-jvt3" \
  --handler-options '{
    "domain": "data.cityofchicago.org",
    "tables": {
        "traffic_crashes_vehicles": "68nd-jvt3"
    }
}'

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, cityofchicago/traffic-crashes-vehicles-68nd-jvt3 is just another Postgres schema.