Athena string to timestamp
This article looks at how to use Amazon Athena with a column which contains dates in multiple different formats. The sections below work through step-by-step how we get to our solution. To start with we need some sample data containing dates in a variety of formats.
We can use this to test our date parsing code on. The syntax is:. Using try will remove the error and allow the query to execute, but still won't convert the dates in the non-conforming formats we'll get there though.
Presto/Athena Examples: Date and Datetime functions
The query below also includes an additional column to assist with identifying which dates were successfully converted. The coalesce conditional expression returns the first non-null value. Using this you can support a wide range of custom date formats without causing errors in your query. This website is copyrightMohawk Technologies Ltd. No content on this website may be reproduced without prior written consent. Technical articles on this site should be used for reference purposes only and no legal guarantee is being made as to fitness for any purpose, often content is aimed at demonstrating a concept and may not be suitable for use in a production environment.
All third party trademarks are the property of their respective owners. Cloud Junkie. Sample Data for Testing To start with we need some sample data containing dates in a variety of formats. Supported Format Strings.
Converting Multiple Different Formats Initial Error Using the same query as above, but with the full test data, will result in an error. Using Coalesce to Support Additional Formats. Searching 1.If you've got a moment, please tell us what we did right so we can do more of it. Thanks for letting us know this page needs work. We're sorry we let you down.
If you've got a moment, please tell us how we can make the documentation better. When you create a table from CSV data in Athena, determine what types of values it contains:. If data does not contain values enclosed in double quotes "you can omit specifying any SerDe. Uses double quotes " as the default quote character, and allows you to specify separator, quote, and escape characters, such as:. See the example in this topic.
Does not support empty fields in columns defined as a numeric data type. To further convert columns to the desired type in a table, you can create a view over the table and use CAST to convert to the desired type.
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Is there an error in my query or is Athena not able to handle greater than operators on date columns? You need to use a cast to format the date correctly before making this comparison. Try the following:. Learn more. Athena greater than condition in date column Ask Question. Asked 1 year, 9 months ago. Active 8 months ago.
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Viewed 21k times. I have the following query that I am trying to run on Athena. Piotr Findeisen Active Oldest Votes. Barry Piccinni Barry Piccinni 2 2 silver badges 17 17 bronze badges.
Thanks for your reply, but this does not solve the issue. That column is already a date class, I expect this is an issue specific to Amazon Athena databases.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to convert datatype of string eg : 'T Please post the error message on our forum or contact customer support with Query Id: 6b4ae2e1-fbeaad Reason : Because date in string format and have to convert into timestamp. But I don't know how to convert it. Learn more.
How to convert string into timestamp in Presto Athena? Ask Question. Asked 2 years ago. Active 7 months ago. Viewed 9k times. Piotr Findeisen Harshit Agrawal Harshit Agrawal 51 1 1 silver badge 3 3 bronze badges. Active Oldest Votes. Nick I used the following way and it worked for me.
Dheeraj Dheeraj 4 4 silver badges 7 7 bronze badges. You can try something like below. Alpesh Jikadra Alpesh Jikadra 1, 1 1 gold badge 9 9 silver badges 20 20 bronze badges. Devendra Choudhary Devendra Choudhary 26 7 7 bronze badges. The Overflow Blog.
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Viewed 12k times. Piotr Findeisen Louis Louis 1 1 gold badge 6 6 silver badges 17 17 bronze badges. Active Oldest Votes. The reason for not having a conversion function is, that this can be achieved with a type cast. Sign up or log in Sign up using Google. Sign up using Facebook.
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If you still want to do it, something like this will probably work.
If so then use replacechr to change it to something like ':'. Up to version 7. For version 8. I am facing the same issue, your solution might resolve it but I don't understand why the microseconds cannot be converted. US' ]. I did some more research and came to following conclusion. In fact the same applies to the entire time string. I think the integration service fails to read the time if it is all zeros which makes sense because there is no such time in the clock.
US'but found that it did not work for 27 char datetime string either. Why does Informatica PowerCenter 9. It hurt's their brand. It wouldn't work because the formula will look for only 26 characters. What is your format which is resulting in 27 characters?
Previously, we partitioned our data into folders by the numPets property. Here is a listing of that data in S However, by ammending the folder name, we can have Athena load the partitions automatically.
SQL Reference for Amazon Athena
Important: The column name in the object key name must be all lower-case. But in the object key name in S3, we must use numpets. We only have a single partition using the numPets column. This statement will among other thingsinstruct Athena to automatically load all the partitions from the S3 data. Partitioning your data can dramatically reduce the amount of data scanned during your Athena queries.
Please note, by default Athena has a limit of 20, partitions per table. This limit can be raised by contacting AWS Support. Whatever limit you have, ensure your data stays below that limit. Skeddly is the leading scheduling service for your AWS account.
Using Skeddly, you can:. Sign-up for our 30 day free trial or sign-in to your Skeddly account to get started. Toggle navigation. Blog Archives Subscribe Login Sign-up. Skeddly Blog Skeddly news and announcements In this article, we will show how to load the partitions automatically.
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