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 dmv_office_locations_hours_and_messages table in this repository, by referencing it like:
"ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws:latest"."dmv_office_locations_hours_and_messages"or in a full query, like:
SELECT
":id", -- Socrata column ID
"monday_opening_hours", -- Monday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"thursday_opening_hours", -- Thursday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"office_holiday", -- The name of the next, upcoming, business holiday that NYS observes. It is never null.
"wednesday_closing_hours", -- Wednesday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"monday_closing_hours", -- Monday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"thursday_closing_hours", -- Thursday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"tuesday_closing_hours", -- Tuesday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"saturday_closing_hours_summer", -- Saturday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"wednesday_opening_hours_summer", -- Wednesday‘s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"saturday_closing_hours", -- Saturday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"street_address", -- Office location street address. It is never null.
"tuesday_opening_hours_summer", -- Tuesday’s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"friday_opening_hours", -- Friday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"georeference", -- Open Data platform-generated geocoding information from supplied address components. Point-type location is the centroid of the address components provided and does not reflect a specific address if the street address component is not provided. Point-type location is supplied in "POINT (<geocoded longitude> <geocoded latitude>)" format.
"tuesday_closing_hours_summer", -- Tuesday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"tuesday_opening_hours", -- Tuesday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"county", -- Office location county. It is never null.
"directions", -- Location information regarding the office named in this record. It can be null.
"zip", -- Office location Unites States Postal Service Zone Improvement Plan code. It is never null.
"friday_closing_hours_summer", -- Friday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"wednesday_closing_hours_summer", -- Wednesday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"office_type", -- A category that describes the line of business that the office conducts. It is never null. DISTRICT OFFICE is a NYS operated office that performs routine driver, non-driver and vehicle transactions for the public. COUNTY OFFICE is a County Clerk operated office that performs routine driver, non-driver and vehicle transactions for the public. MOBILE OFFICE is a NYS or County Clerk operated office, that can process limited types of DMV transactions, that is open in different locations on specific dates and times. TRAFFIC VIOLATIONS BUREAU is a NYS operated court, that adjudicates traffic violations and conducts hearings. WISE PARTNER is a private sector operated office that can process limited types of DMV transactions.
"hours_begin_date_summer", -- This office operates on a summer schedule from this date until “Hours End Date Summer”. It can be null.
"sunday_opening_hours_summer", -- Sunday‘s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"hours_message", -- Service information regarding the office named in this record. It can include HTML markup and can be null.
"friday_opening_hours_summer", -- Friday ‘s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"thursday_opening_hours_summer", -- Thursday‘s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"saturday_opening_hours", -- Saturday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"street_address_line_2", -- Office location street address continuation. It can be null.
"message", -- Additional information regarding this office. It can include HTML markup and can be null.
"friday_closing_hours", -- Friday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"office_holiday_date", -- The date of the next, upcoming, business holiday that NYS observes. It is never null.
"office_name", -- NYS DMV’s name for this office location. Not all offices appear in this table. It is never null.
"thursday_closing_hours_summer", -- Thursday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"office_web_link", -- The URL for this office’s web page. It can be null.
":@computed_region_wbg7_3whc", -- This column was automatically created in order to record in what polygon from the dataset 'New York Zip Codes' (wbg7-3whc) the point in column 'georeference' is located. This enables the creation of region maps (choropleths) in the visualization canvas and data lens.
":@computed_region_kjdx_g34t", -- This column was automatically created in order to record in what polygon from the dataset 'Counties' (kjdx-g34t) the point in column 'georeference' is located. This enables the creation of region maps (choropleths) in the visualization canvas and data lens.
":@computed_region_yamh_8v7k", -- This column was automatically created in order to record in what polygon from the dataset 'NYS Municipal Boundaries' (yamh-8v7k) the point in column 'georeference' is located. This enables the creation of region maps (choropleths) in the visualization canvas and data lens.
"sunday_opening_hours", -- Sunday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"monday_opening_hours_summer", -- Monday’s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"hours_end_date_summer", -- This office operates on a summer schedule from “Hours Begin Date Summer” until this date. It can be null.
"city", -- Office location city. It is never null.
"message_end_date", -- “Message” applies to this office’s record from “Message Begin Date” until this date.
"wednesday_opening_hours", -- Wednesday’s opening time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"monday_closing_hours_summer", -- Monday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"saturday_opening_hours_summer", -- Saturday ‘s opening time, within New York State’s time zone, when summer hours are in effect. It can be null.
"state", -- Office location state abbreviation. It is never null.
"sunday_closing_hours", -- Sunday’s closing time, within New York State’s time zone, when summer hours are not in effect. It can be null.
"sunday_closing_hours_summer", -- Sunday’s closing time, within New York State’s time zone, when summer hours are in effect. It can be null.
"message_begin_date" -- “Message” applies to this office’s record from this date until “Message End Date”.
FROM
"ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws:latest"."dmv_office_locations_hours_and_messages"
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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws 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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws: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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xswsCheckout 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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws:latestThis will download all the objects for the latest tag of ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws 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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws: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 ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws: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, ny-gov/dmv-office-locations-hours-and-messages-kfpc-xsws is just another Postgres schema.