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63 lines
2.4 KiB
Transact-SQL
63 lines
2.4 KiB
Transact-SQL
USE sales
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GO
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-- Create external data source for HDFS inside SQL big data cluster.
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--
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IF NOT EXISTS(SELECT * FROM sys.external_data_sources WHERE name = 'SqlStoragePool')
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CREATE EXTERNAL DATA SOURCE SqlStoragePool
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WITH (LOCATION = 'sqlhdfs://controller-svc/default');
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-- Create file format for CSV file with appropriate properties.
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--
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IF NOT EXISTS(SELECT * FROM sys.external_file_formats WHERE name = 'csv_file')
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CREATE EXTERNAL FILE FORMAT csv_file
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WITH (
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FORMAT_TYPE = DELIMITEDTEXT,
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FORMAT_OPTIONS(
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FIELD_TERMINATOR = ',',
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STRING_DELIMITER = '"',
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USE_TYPE_DEFAULT = TRUE)
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);
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-- Create external table over HDFS data source (SqlStoragePool) in
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-- SQL Server 2019 big data cluster. The SqlStoragePool data source
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-- is a special data source that is available in any new database in
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-- SQL Master instance.
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--
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IF NOT EXISTS(SELECT * FROM sys.external_tables WHERE name = 'web_clickstreams_hdfs_csv')
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CREATE EXTERNAL TABLE [web_clickstreams_hdfs_csv]
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("wcs_click_date_sk" BIGINT , "wcs_click_time_sk" BIGINT , "wcs_sales_sk" BIGINT , "wcs_item_sk" BIGINT , "wcs_web_page_sk" BIGINT , "wcs_user_sk" BIGINT)
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WITH
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(
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DATA_SOURCE = SqlStoragePool,
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LOCATION = '/clickstream_data',
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FILE_FORMAT = csv_file
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);
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GO
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-- Join external table with local tables
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--
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SELECT
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wcs_user_sk,
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SUM( CASE WHEN i_category = 'Books' THEN 1 ELSE 0 END) AS book_category_clicks,
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SUM( CASE WHEN i_category_id = 1 THEN 1 ELSE 0 END) AS [Home & Kitchen],
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SUM( CASE WHEN i_category_id = 2 THEN 1 ELSE 0 END) AS [Music],
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SUM( CASE WHEN i_category_id = 3 THEN 1 ELSE 0 END) AS [Books],
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SUM( CASE WHEN i_category_id = 4 THEN 1 ELSE 0 END) AS [Clothing & Accessories],
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SUM( CASE WHEN i_category_id = 5 THEN 1 ELSE 0 END) AS [Electronics],
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SUM( CASE WHEN i_category_id = 6 THEN 1 ELSE 0 END) AS [Tools & Home Improvement],
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SUM( CASE WHEN i_category_id = 7 THEN 1 ELSE 0 END) AS [Toys & Games],
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SUM( CASE WHEN i_category_id = 8 THEN 1 ELSE 0 END) AS [Movies & TV],
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SUM( CASE WHEN i_category_id = 9 THEN 1 ELSE 0 END) AS [Sports & Outdoors]
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FROM [dbo].[web_clickstreams_hdfs_csv]
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INNER JOIN item it ON (wcs_item_sk = i_item_sk
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AND wcs_user_sk IS NOT NULL)
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GROUP BY wcs_user_sk;
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GO
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-- Cleanup
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/*
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DROP EXTERNAL TABLE [dbo].[web_clickstreams_hdfs_csv];
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GO
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*/
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