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 311_call_centre_satisfaction_survey_2017 table in this repository, by referencing it like:
"edmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb:latest"."311_call_centre_satisfaction_survey_2017"or in a full query, like:
SELECT
":id", -- Socrata column ID
"q17bm1", -- You are aware of the 311 app, but have not used it. What has prevented you from using the 311 app?
"q15m2", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q15m1", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q12m4", -- Even though the information might be available on the City website, why did you choose to call 311 instead of looking through the City website? Is it because...
"q12m1", -- Even though the information might be available on the City website, why did you choose to call 311 instead of looking through the City website? Is it because...
"q11m1", -- Why did you choose to call 311? Is it because...
"q3g", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The agent processed your call promptly, without a lengthy wait or hold period
"qs3m3", -- What was the purpose of your call / calls to 311 in the past six months?
"qs4", -- And what was the purpose of your most recent call to 311? Was it…?
"d3", -- In which of the following age categories do you belong?
"q15m4", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q14m5", -- Why did you choose to call 311? Is it because...
"q14m4", -- Why did you choose to call 311? Is it because...
"q13a3", -- Did you use Buslink to check transit information?
"q12a2", -- Are you aware of the following self-service options through which you can access information about ETS services? - ETS TO GO - a modified version of the Google trip planner which can be used on your mobile devices
"q12m3", -- Even though the information might be available on the City website, why did you choose to call 311 instead of looking through the City website? Is it because...
"q11m6", -- Why did you choose to call 311? Is it because...
"q3b", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The length of time it took to reach a 311 agent
"q1", -- Overall, how satisfied were you with your experience with the most recent call to 311?
"qs3m4", -- What was the purpose of your call / calls to 311 in the past six months?
"qs3m2", -- What was the purpose of your call / calls to 311 in the past six months?
"qn1", -- Have you called / contacted 311 services over the telephone in the past six months to enquire about ETS or Edmonton Transit System such as for a bus schedule, when is the next bus expected, when the next LRT is expected, what is the best route to reach y
"q17c", -- How satisfied are you with the 311 app? Are you…
"q13a2", -- Did you use ETS to Go to check transit information?
"q13a5", -- Did you use Edmonton.ca to check transit information?
"q13a4", -- Did you use ETS Text and Ride to check transit information?
"q12a3", -- Are you aware of the following self-service options through which you can access information about ETS services? - BUSLINK - where you can call 780 496 1600 anytime to get automated information about ETS services
"q12a1", -- Are you aware of the following self-service options through which you can access information about ETS services? - GOOGLE TRIP PLANNER available on the ETS website through which you can plan your route from start to finish
"q13a1", -- Did you use Google Trip Planner to check transit information?
"q15m6", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q11m5", -- Why did you choose to call 311? Is it because...
"q6m3", -- Tell us why you had to call back on the same issue.
"q17bm3", -- You are aware of the 311 app, but have not used it. What has prevented you from using the 311 app?
"q17bm2", -- You are aware of the 311 app, but have not used it. What has prevented you from using the 311 app?
"qs3m1", -- What was the purpose of your call / calls to 311 in the past six months?
"q3h", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. Your reason for calling was resolved in a timely manner
"q3f", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The agent was knowledgeable
"q3a", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The ease of contacting 311
"q2m4", -- Why were you <Q1> with your most recent call experience?
"q12a5", -- Are you aware of the following self-service options through which you can access information about ETS services? - Edmonton.ca - The City of Edmonton website where you can access information about ETS
"q10", -- Did you check for information about ... on the City website?
"qs5m1", -- Was your last call to 311 for transit information to ...
"qs1", -- Have you called / contacted 311 services over the telephone in the past six months?
"d1", -- Gender
"q3c", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The agent was helpful
"q14m9", -- Why did you choose to call 311? Is it because...
"q12m5", -- Even though the information might be available on the City website, why did you choose to call 311 instead of looking through the City website? Is it because...
"q17a", -- Have you used the 311 app in the past 12 months?
"q4om2", -- Why do you say so?
"qs2", -- How many times have you called 311 services in the past six months?
"q4", -- To what extent do you agree or disagree to the following statement... 311 makes it convenient for Edmontonians to obtain information or seek the service that they want.
"q17", -- Are you aware that the City of Edmonton has a 311 app which you can access on your mobile device and report your concerns while you are on the go?
"q3e", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The agent was courteous and professional
"q14m3", -- Why did you choose to call 311? Is it because...
"q12a4", -- Are you aware of the following self-service options through which you can access information about ETS services? - ETS Text and Ride - where you can text a bus or bus stop number and get schedule information on your mobile
"q14m8", -- Why did you choose to call 311? Is it because...
"q14m6", -- Why did you choose to call 311? Is it because...
"q14m7", -- Why did you choose to call 311? Is it because...
"q9m1", -- Do you know about the City of Edmonton website and 311 online?
"q4om3", -- Why do you say so?
"q6m2", -- Tell us why you had to call back on the same issue.
"q6m1", -- Tell us why you had to call back on the same issue.
"q5", -- You said that you had called 311 ... times. Thinking about the most recent call to 311, were you calling to follow up on an earlier issue or enquiry...
"qs5m2", -- Was your last call to 311 for transit information to ...
"q3d", -- Again, thinking about your most recent call to 311, how satisfied were you on the following aspects of your last call. The information provided was accurate
"qs3m5", -- What was the purpose of your call / calls to 311 in the past six months?
"qs5m3", -- Was your last call to 311 for transit information to ...
"q15m5", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q2m3", -- Why were you <Q1> with your most recent call experience?
"q2m2", -- Why were you <Q1> with your most recent call experience?
"q2m1", -- Why were you <Q1> with your most recent call experience?
"q16m3", -- Thinking overall about the 311 service, do you have any suggestions about how to improve it?
"q16m2", -- Thinking overall about the 311 service, do you have any suggestions about how to improve it?
"q14m1", -- Why did you choose to call 311? Is it because...
"q14m2", -- Why did you choose to call 311? Is it because...
"q16m1", -- Thinking overall about the 311 service, do you have any suggestions about how to improve it?
"q15m3", -- Even though the information might be available through the self-service options, why did you choose to call 311 instead of using a self-serving option? Is it because...
"q9m2", -- Do you know about the City of Edmonton website and 311 online?
"q11m3", -- Why did you choose to call 311? Is it because...
"q11m2", -- Why did you choose to call 311? Is it because...
"q4om1", -- Why do you say so?
"q12m2", -- Even though the information might be available on the City website, why did you choose to call 311 instead of looking through the City website? Is it because...
"q11m4" -- Why did you choose to call 311? Is it because...
FROM
"edmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb:latest"."311_call_centre_satisfaction_survey_2017"
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 edmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb with SQL in under 60 seconds.
This repository is an "external" repository. That means it's hosted elsewhere, in this case at data.edmonton.ca. When you queryedmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb: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.edmonton.ca, 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 \
"edmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb" \
--handler-options '{
"domain": "data.edmonton.ca",
"tables": {
"311_call_centre_satisfaction_survey_2017": "axkt-yjmb"
}
}'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, edmonton-ca/311-call-centre-satisfaction-survey-2017-axkt-yjmb is just another Postgres schema.