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 feed_the_future_tajikistan_zone_of_influence table in this repository, by referencing it like:
"usaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn:latest"."feed_the_future_tajikistan_zone_of_influence"or in a full query, like:
SELECT
":id", -- Socrata column ID
"i30", -- Did child s name have any thin porridge?
"f06", -- How often did this happen in the past 4 weeks 30 days ?
"hhwght", -- Derived variable, household weight
"nomilk", -- Total Number of 6 Food Groups (Not Including Dairy, NBF children)
"d09", -- What is the main source of water for purposes of bathing, washing, cooking, kitchen garden, etc.?
"i19", -- Was child s name given any vitamin drops or other medicines as drops yesterday during the day or at night?
"i43", -- Any foods made from beans, peas, lentils, nuts, or seeds
"othfrtgrp", -- Other fruits and vegetables
"d11", -- What is the secondary source of cooking fuel for your household?
"a02", -- Cluster number
"eggsgrp", -- Eggs
"i04_dd", -- On what day was child s name born? What is his her birthday?
"country", -- Country recorded in module A
"d03", -- Exterior Walls
"i36", -- Any dark green leafy vegetables such as cabbage, lettuce
"i28", -- Yogurt?
"f02", -- How often did this happen in the past 4 weeks 30 days ?
"haz2", -- Height for Age ( -2sd)
"i08", -- CHECK I06. IS THE CHILD UNDER 60 MONTHS?
"d07", -- What is the main source of electricity?
"d10", -- What is the secondary source of electricity?
"i42", -- Fresh or dried fish or seafood
"i18", -- Did child s name consume breast milk in any of these ways yesterday during the day or at night?
"milkfeeds", -- Breast milk or milk products
"milkgrp", -- Dairy products (milk, yogurt, cheese)
"totalfeeds", -- Total Number of Feedings
"waz2", -- Weight for Age ( -2sd)
"i07_mo", -- ARE YEAR AND MONTH OF BIRTH RECORDED IN I04 CONSISTENT WITH AGE IN MONTHS RECORDED IN I06?
"i25", -- How many times yesterday during the day or at night did child s name consume any milk?
"i06", -- How many months old is child s name ? RECORD AGE IN COMPLETED MONTHS
"a09",
"i12", -- Derived in ODK
"i48", -- NOT COLLECTED IN THIS SURVEY
"i04_yy", -- In what year was child s name born? What is his her birthday?
"a05", -- Sex of respondent:
"chwght", -- WEIGHT IN KILOGRAMS
"i04_mm", -- In what month was child s name born? What is his her birthday?
"bmiz",
"i23", -- How many times yesterday during the day or at night did child s name consume any formula?
"d04", -- How many rooms are there in this dwelling?
"i01", -- CAREGIVER S ID CODE FROM THE HOUSEHOLD ROSTER
"minmore", -- Min. Meal Freq. for BF Children
"d01", -- Roof top material (outer covering):
"f01", -- In the past 4 weeks 30 days was there ever no food to eat of any kind in your house because of lack of resources to get food?
"i34", -- Pumpkin, carrots, squash that are yellow or orange inside or other yellow orange foods as pepper
"i17", -- Was child s name breastfed yesterday during the day or at night?
"i15", -- CHECK QUESTION I05. IS THE CHILD UNDER 2 YEARS OF AGE?
"a06", -- Type of household:
"haz",
"d02", -- Floor material
"i13_a", -- NOT COLLECTED IN THIS SURVEY
"i39", -- Liver, kidney, heart, or other organ meats
"modd_missing",
"i33", -- Food made from grains, such as bread, rice, noodles, porridge, or other grain food
"f04", -- How often did this happen in the past 4 weeks 30 days ?
"i26", -- Did child s name have any juice or juice drinks?
"i41", -- Eggs
"i38", -- Any other fruits or vegetables
"i49", -- NOT COLLECTED IN THIS SURVEY
"i47", -- Condiments for flavor, such as chilies, spices, herbs, or fish powder
"xbf", -- Exclusive Breastfeeding
"allgrp", -- Total Number of 7 Food Groups (BF children)
"id_code", -- Respondent ID in the household
"i05", -- How old was child s name at his her last birthday? RECORD AGE IN COMPLETED YEARS
"i31", -- Any other liquids such as Manka, ?
"bf", -- Currently breastfeeding
"i35", -- Potatoes, or any other foods made from roots
"i46", -- Any sugary foods such as chocolates, sweets, candies, pastries, cakes, or biscuits
"d06", -- What is the main source of drinking water for your household?
"i14", -- NOT COLLECTED IN THIS SURVEY
"fleshgrp", -- Flesh foods (meat, fish, poultry and liver organ meats)
"mad", -- FTF Minimum Acceptable Diet
"i32", -- Any other liquids?
"d08", -- What is the main source of cooking fuel for your household?
"i16", -- Has child s name ever been breastfed?
"i51", -- How many times did child s name eat solid, semi-solid, or soft foods other than liquids yesterday during the day or at night?
"i24", -- Did child s name have any milk such as tinned, powdered, or fresh animal milk?
"waz",
"grainsgrp", -- Grains, roots and tubers
"anymilk",
"i44", -- Cheese, yogurt, or other milk products
"pbs_id",
"i37", -- NOT COLLECTED IN THIS SURVEY
"modf_missing",
"i21", -- Plain water?
"i29", -- How many times yesterday during the day or at night did child s name consume any yogurt?
"i45", -- Any oil, fats, or butter, or foods made with any of these
"i09", -- DOES CHILD HAVE EDEMA?
"whz2", -- Weight for Height ( -2sd)
"d05", -- What is the main type of toilets your household uses?
"i50", -- Did child s name eat any solid, semi-solid, or soft foods yesterday during the day or at night?
"i13_consent", -- NOT COLLECTED IN THIS SURVEY
"i27", -- Clear broth?
"i11", -- HEIGHT IN CENTIMETERS
"f05", -- In the past 4 weeks 30 days did you or any household member go a whole day and night without eating anything at all because there was not enough food?
"urbrur", -- Urban, rural
"i40", -- Any meat, such as beef, pork, lamb, goat, chicken, or duck
"i22", -- Infant formula such as Baby, Malyutka
"i10", -- WEIGHT IN KILOGRAMS:
"vitagrp", -- Vit. A rich fruits and vegetables
"beansgrp", -- Legumes and nuts
"i20", -- Was child s name given rehydron yesterday during the day or at night?
"whz",
"a21",
"i03", -- What is child s name s sex?
"i49x", -- OTHER FOODS: PLEASE WRITE DOWN OTHER FOODS THAT RESPONDENT MENTIONED BUT ARE NOT IN THE LIST.
"i07_yr", -- IS THE YEAR RECORDED IN I04 CONSISTENT WITH THE AGE IN YEARS RECORDED IN I05?
"f03" -- In the past 4 weeks 30 days did you or any household member go to sleep at night hungry because there was not enough food?
FROM
"usaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn:latest"."feed_the_future_tajikistan_zone_of_influence"
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 usaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn with SQL in under 60 seconds.
This repository is an "external" repository. That means it's hosted elsewhere, in this case at data.usaid.gov. When you queryusaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn: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
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.usaid.gov, 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 \
"usaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn" \
--handler-options '{
"domain": "data.usaid.gov",
"tables": {
"feed_the_future_tajikistan_zone_of_influence": "mhrn-ihhn"
}
}'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, usaid-gov/feed-the-future-tajikistan-zone-of-influence-mhrn-ihhn is just another Postgres schema.