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47 lines
1.2 KiB
Transact-SQL
47 lines
1.2 KiB
Transact-SQL
USE sales
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GO
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-- Create file format for CSV separated 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 = 'product_reviews_hdfs_csv')
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CREATE EXTERNAL TABLE [product_reviews_hdfs_csv]
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("pr_review_sk" BIGINT , "pr_review_content" varchar(8000))
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WITH
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(
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DATA_SOURCE = SqlStoragePool,
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LOCATION = '/product_review_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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p.pr_review_sk, pc.pr_review_content
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FROM product_reviews as p
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JOIN (SELECT TOP(10) * FROM product_reviews_hdfs_csv) AS pc
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ON pc.pr_review_sk = p.pr_review_sk;
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GO
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-- Cleanup
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/*
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DROP EXTERNAL TABLE [dbo].[product_reviews_hdfs_csv];
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GO
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*/
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