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1. Deploy the server

Hydra is available as open source and a fully managed cloud database. To spin up a cloud database, navigate to https://www.hydra.so/ to join our cloud waitlist. For a detailed walkthrough, navigate to the Setting up Hydra Cloud guide.

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2. Create analytics schema and table

We will connect to Hydra using psql, the terminal-based front-end to Postgres, but you can use any Postgres client you’d prefer and achieve the same result. We will start by creating our analytics schema with a table “analytics.rides” which we will populate with sample data from the New York Taxi data in step 3.

CREATE EXTENSION pg_duckdb;
CREATE SCHEMA analytics;
CREATE TABLE analytics.rides
(
	vendor_id text,
	pickup_datetime timestamp,
	dropoff_datetime timestamp,
	passenger_count int,
	trip_distance float,
	pickup_longitude float,
	pickup_latitude float,
	rate_code text,
	store_and_fwd_flag text,
	dropoff_longitude float,
	dropoff_latitude float,
	fare_amount float,
	surcharge float,
	mta_tax float,
	tip_amount float,
	tolls_amount float,
	total_amount float
)
USING duckdb;

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3. Insert sample data

Let’s insert the New York Taxi data into our rides table in the analytics schema. Below we’ve written example queries you can copy / paste.

INSERT INTO analytics.rides
SELECT *
FROM
read_parquet('https://idl.uw.edu/mosaic-datasets/data/nyc-rides-2010.parquet')
AS
(
	vendor_id text,
	pickup_datetime timestamp,
	dropoff_datetime timestamp,
	passenger_count int,
	trip_distance float,
	pickup_longitude float,
	pickup_latitude float,
	rate_code text,
	store_and_fwd_flag text,
	dropoff_longitude float,
	dropoff_latitude float,
	fare_amount float,
	surcharge float,
	mta_tax float,
	tip_amount float,
	tolls_amount float,
	total_amount float
);

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4. Run example queries

Run each statement by clicking the green triangle next to each query.

SELECT count(*) FROM analytics.rides;
SELECT * FROM analytics.rides LIMIT 10;
SELECT
   vendor_id,
   count(*) AS count,
   sum(fare_amount) AS revenue
FROM analytics.rides
GROUP BY vendor_id
ORDER BY count DESC
LIMIT 10;
  • Query 0: SELECT COUNT(*) … counts the number of rows in the analytics.rides table.
  • Query 1: SELECT * FROM … retrieves up to 10 rows of data from the analytics.rides table.
  • Query 2: SELECT vendor_id … is list of the top 10 vendors, displaying the number of rides and total revenue for each, ordered by the greatest number of rides first.

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5. Insert existing data

Now let’s test Hydra with your own data. If you have existing data in PostgreSQL, S3, Google Cloud Storage, or local files it’s a good idea to drop the “analytics.rides” sample data that was inserted earlier before loading your own files.

To delete the sample data, run the following:

DROP TABLE analytics.rides;

Note: Browse the codebox tabs to steps for S3, Postgres, and/or local data.

-- Connect bucket, Session token is optional
INSERT INTO duckdb.secrets
 (type, key_id, secret, session_token, region)
 VALUES ('S3', 'access_key_id', 'secret_access_key', 'session_token', 'us-east-1');

-- example: create a table in the analytics schema from a file in S3.
CREATE TABLE analytics.your_table_name 
USING duckdb
AS
SELECT *
FROM read_parquet('s3://your_bucket_name/your_file_name.parquet') AS
(
   -- specify columns and types here, e.g.:
   -- id int,
   -- name text, ...
);

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What’s Next?

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