amazon-s3-select | 易学教程

How S3 select pricing works? What is data returned and scanned in s3 select means

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问题 I have a 1M rows of CSV data. select 10 rows, Will I be billed for 10 rows. What is data returned and data scanned means in S3 Select? There is less documentation on these terms of S3 select 回答1: To keep things simple lets forget for some time that S3 reads in a columnar way. Suppose you have the following data: | City | Last Updated Date | |------------|---------------------| | London | 1st Jan | | London | 2nd Jan | | New Delhi | 2nd Jan | A query for fetching the latest update date forces

Parse expression with binary and unary operators, reserved words, and without parentheses

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来源： https://stackoverflow.com/questions/63551692/parse-expression-with-binary-and-unary-operators-reserved-words-and-without-pa

How to get list of all columns from a parquet file using s3 select?

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问题 I have a parquet file stored in S3 bucket. I want to get the list of all columns of the parquet file. I am using s3 select but it just give me list of all rows wihtout any column headers. Is there anyway to get all column names from this parquet file without downloading it completely? Since parquet file can be very large, I would not want to download the entire parquet file which is why I am using s3 select to pick first few rows using select * from S3Object LIMIT 10 I tried to fetch column

Strange results from using AWS S3 SELECT to get CSV data into SQL table

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问题 I have written an AWS State Machine in C# to load data from a CSV file from an S3 Bucket, into a SQL Server database table but I'm getting really odd data into the table. The two main functions are as follows, the first gets the response payload, the second breaks this up into lines that can then be inserted. private static async Task<ISelectObjectContentEventStream> GetSelectObjectContentEventStream(S3Object s3Object, AmazonS3Client s3Client, ObjectDefinition definition) { var response =

Can S3 Select search multiple objects?

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问题 I'm testing out S3 Select and as far as I understand from the examples, you can treat a single object (CSV or JSON) as a data store. I wanted to have a single JSON document per S3 object and search the entire bucket as a 'database'. I'm saving each 'file' as <ID>.json and each file has JSON documents with the same schema. Is it possible to search multiple objects in a single call? i.e. Find all JSON documents where customerId = 123 ? 回答1: It appears that Amazon S3 Select operates on only one

S3 Select CSV Headers

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问题 I am using S3 Select to read csv file from S3 Bucket and outputting as CSV. In the output I only see rows, but not headers. How do I get output with headers included. import boto3 s3 = boto3.client('s3') r = s3.select_object_content( Bucket='demo_bucket', Key='demo.csv', ExpressionType='SQL', Expression="select * from s3object s", InputSerialization={'CSV': {"FileHeaderInfo": "Use"}}, OutputSerialization={'CSV': {}}, ) for event in r['Payload']: if 'Records' in event: records = event['Records

does aws s3 select work with multiple files?

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问题 I'm using S3 select to query a object from a file in S3 bucket but wondering if I can do it with multiple files or if its limited to just one. I wrote one query from a file using aws lambda but when I tried writing another one for a different file it gave me a error message. 回答1: Amazon S3 Select operates on only one object. To query multiple files at once on S3 with a SQL syntax you should use Amazon Athena. 来源： https://stackoverflow.com/questions/51312541/does-aws-s3-select-work-with

does aws s3 select work with multiple files?

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I'm using S3 select to query a object from a file in S3 bucket but wondering if I can do it with multiple files or if its limited to just one. I wrote one query from a file using aws lambda but when I tried writing another one for a different file it gave me a error message. Amazon S3 Select operates on only one object. To query multiple files at once on S3 with a SQL syntax you should use Amazon Athena . 来源： https://stackoverflow.com/questions/51312541/does-aws-s3-select-work-with-multiple-files