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 summer_meal_programs_summer_food_service_program table in this repository, by referencing it like:
"texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn:latest"."summer_meal_programs_summer_food_service_program"or in a full query, like:
SELECT
":id", -- Socrata column ID
"suppermealsreimbursed", -- Total number of suppers claimed by sites sponsored by Contracting Entity (CE) for claim month
"supperreimbursement", -- Total supper reimbursement for claim month
"pmsnackreimbursement", -- Total afternoon snack reimbursement for claim month
"esc", -- Educational Service Center (ESC) region
"cecounty", -- County in which the Contracting Entity (CE) is located
"cename", -- Contracting Entity (CE) name
"sitecount", -- Number of sites sponsored by the Contracting Entity (CE) for the Summer Food Service Program (SFSP) summer feeding program
"reporttype", -- Type of information being reported in the dataset
"typeofagency", -- Type of agency the Contracting Entity (CE) operates as. Data displayed as: Educational Institution/Government Agency/Indian Tribe/Military Installation/Private Non Profit Organization
"programyear", -- A program period for summer meal programs is defined as mid-May through the end of August for the same calendar year.
"lunchreimbursement", -- Total lunch reimbursement for claim month
"claimdate", -- Month and year being reported for reimbursement of meals served
"lunchmealsreimbursed", -- Total number of lunches claimed by sites sponsored by Contracting Entity (CE) for claim month
"pmsnackmealsreimbursed", -- Total number of afternoon snacks claimed by sites sponsored by Contracting Entity (CE) for claim month
"adminreimbursement", -- Total administrative reimbursement for claim month
"breakfastreimbursement", -- Total breakfast reimbursement for claim month
"amsnackreimbursement", -- Total morning snack reimbursement for claim month
"totalreimbursement", -- Total federal meal reimbursement for claim month
"amsnackmealsreimbursed", -- Total number of morning snacks claimed by sites sponsored by Contracting Entity (CE) for claim month
"breakfastmealsreimbursed", -- Total number of breakfasts claimed by sites sponsored by Contracting Entity (CE) for claim month
"ceid", -- Unique number assigned to Contracting Entity (CE) to identify organization as a program sponsor
"tdaregion", -- Texas Department of Agriculture (TDA) service region
"typeofsfsporg" -- Site designation for type of organization. Data displayed as: Nonresidential Summer Camp/Private Non Profit/Residential Camp/School Food Authority/Unit of Government
FROM
"texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn:latest"."summer_meal_programs_summer_food_service_program"
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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn 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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn: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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crnCheckout 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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn:latestThis will download all the objects for the latest tag of texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn 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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn: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 texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn: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, texas-gov/summer-meal-programs-summer-food-service-program-sba7-5crn is just another Postgres schema.