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Clean up formatting and comments in big_query.sql #837

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Clean up formatting and comments in big_query.sql #837

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46 changes: 28 additions & 18 deletions 03-data-warehouse/big_query.sql
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Original file line number Diff line number Diff line change
@@ -1,29 +1,35 @@
-- Query public available table
SELECT station_id, name FROM
bigquery-public-data.new_york_citibike.citibike_stations
SELECT
station_id,
name
FROM bigquery-public-data.new_york_citibike.citibike_stations
LIMIT 100;


-- Creating external table referring to gcs path
-- Create an external table referencing files in GCS
CREATE OR REPLACE EXTERNAL TABLE `taxi-rides-ny.nytaxi.external_yellow_tripdata`
OPTIONS (
format = 'CSV',
uris = ['gs://nyc-tl-data/trip data/yellow_tripdata_2019-*.csv', 'gs://nyc-tl-data/trip data/yellow_tripdata_2020-*.csv']
format = 'CSV',
uris = [
'gs://nyc-tl-data/trip data/yellow_tripdata_2019-*.csv',
'gs://nyc-tl-data/trip data/yellow_tripdata_2020-*.csv'
]
);

-- Check yellow trip data
SELECT * FROM taxi-rides-ny.nytaxi.external_yellow_tripdata limit 10;
-- Preview yellow trip data from the external table
SELECT *
FROM taxi-rides-ny.nytaxi.external_yellow_tripdata
LIMIT 10;

-- Create a non partitioned table from external table
-- Create a non-partitioned table from the external table
CREATE OR REPLACE TABLE taxi-rides-ny.nytaxi.yellow_tripdata_non_partitioned AS
SELECT * FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;

SELECT *
FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;

-- Create a partitioned table from external table
-- Create a partitioned table from the external table
CREATE OR REPLACE TABLE taxi-rides-ny.nytaxi.yellow_tripdata_partitioned
PARTITION BY
DATE(tpep_pickup_datetime) AS
SELECT * FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;
PARTITION BY DATE(tpep_pickup_datetime) AS
SELECT *
FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;

-- Impact of partition
-- Scanning 1.6GB of data
Expand All @@ -36,8 +42,11 @@ SELECT DISTINCT(VendorID)
FROM taxi-rides-ny.nytaxi.yellow_tripdata_partitioned
WHERE DATE(tpep_pickup_datetime) BETWEEN '2019-06-01' AND '2019-06-30';

-- Let's look into the partitions
SELECT table_name, partition_id, total_rows
-- Inspect table partitions
SELECT
table_name,
partition_id,
total_rows
FROM `nytaxi.INFORMATION_SCHEMA.PARTITIONS`
WHERE table_name = 'yellow_tripdata_partitioned'
ORDER BY total_rows DESC;
Expand All @@ -46,7 +55,8 @@ ORDER BY total_rows DESC;
CREATE OR REPLACE TABLE taxi-rides-ny.nytaxi.yellow_tripdata_partitioned_clustered
PARTITION BY DATE(tpep_pickup_datetime)
CLUSTER BY VendorID AS
SELECT * FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;
SELECT *
FROM taxi-rides-ny.nytaxi.external_yellow_tripdata;

-- Query scans 1.1 GB
SELECT count(*) as trips
Expand Down