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 perpetrators_by_relationship_to_their_victims table in this repository, by referencing it like:
"datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq:latest"."perpetrators_by_relationship_to_their_victims"or in a full query, like:
SELECT
":id", -- Socrata column ID
"unmarried_partner_of_parent", -- The number of perpetrators (unique count) with a relationship to their victim(s) of unmarried partner of parent, which is defined as someone who has an intimate relationship with the parent and lives in the household with the parent of the maltreated child. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"other_professional", -- The number of perpetrators (unique count) with a relationship to their victim(s) of other professional, which is defined as a person who had contact with the child as part of his or her job, but the profession is not listed as one of the NCANDS codes. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"foster_parent", -- The number of perpetrators (unique count) with a relationship to their victim(s) of foster parent, which is defined as an individual who provides a home for orphaned, abused, neglected, delinquent, or disabled children under the placement, care, or supervision of the state. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"state", -- The primary unit from which child maltreatment data are collected. This includes all 50 states, the Commonwealth of Puerto Rico, and the District of Columbia. The state column also includes a national row which displays the total sum, percentage, or rate for only those states included in the analysis.
"friend_and_neighbor", -- The number of perpetrators (unique count) with a relationship to their victim(s) of friend and neighbor, which is defined as a nonrelative acquainted with the child, the parent, or caregiver. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"group_home_and_residential", -- The number of perpetrators (unique count) with a relationship to their victim(s) of group home and residential facility staff, which is defined as an employee of a nonfamilial 24-hour care facility. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"legal_guardian", -- The number of perpetrators (unique count) with a relationship to their victim(s) of legal guardian, which is defined as an adult person who has been given legal custody and guardianship of a minor. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"multiple_relationships", -- The number of perpetrators (unique count) with multiple relationships to their victim(s), which is defined as a perpetrator with two or more relationships to their victims. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"unknown", -- The number of perpetrators (unique count) with a relationship to their victim(s) of unknown, which is used when the state may collect data on this variable, but the data for this particular report or child were not captured or are missing. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"relative", -- The number of perpetrators (unique count) with a relationship to their victim(s) of relative, which is defined as a nonparental family member. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"parent", -- The number of perpetrators (unique count) with a relationship to their victim(s) of parent, which is defined as the birth mother or father, adoptive mother or father, or stepmother or stepfather of the child. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"other", -- The number of perpetrators (unique count) with a relationship to their victim(s) of “other,” which is used when the state coding for this field is not one of the codes in the NCANDS record layout. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"total_perpetrators", -- The number of perpetrators (unique count) in each state. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
"child_daycare_provider" -- The number of perpetrators (unique count) with a relationship to their victim(s) of child daycare provider, which is defined as a person with a temporary caregiver responsibility, but who is not related to the child, such as a daycare center staff member, family provider, or babysitter. For more information and definitions of relationships, federal fiscal year, and unique and duplicate counts, see the Glossary in the Child Maltreatment 2019 report.
FROM
"datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq:latest"."perpetrators_by_relationship_to_their_victims"
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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq 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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq: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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvqCheckout 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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq:latestThis will download all the objects for the latest tag of datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq 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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq: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 datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq: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, datahub-hhs-gov/perpetrators-by-relationship-to-their-victims-tw7x-jbvq is just another Postgres schema.