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Indeed a typical optimization technique for Athena is to have files which are big enough ( ~100 MB). What differentiates living as mere roommates from living in a marriage-like relationship? How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. If you want to check out the full operation semantics of MERGE you can read through this. FROM delta.`s3a://delta-lake-aws-glue-demo/updates_delta/` can use SELECT DISTINCT and ORDER BY, as in the following We see the Update action has worked, the product_cd for product_id->1 has changed from A to A1. The following screenshot shows the data file when queried from Amazon Athena. OFFSET clause is evaluated over a sorted result set, and We take a sample csv file, load it into an S3 Bucket then process it using Glue. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. SELECT * INTERSECT returns only the rows that are present in the The job writes the renamed file to the destination S3 bucket. Tried first time on our own data and looks very promising. SELECT statements. Can the game be left in an invalid state if all state-based actions are replaced? How to delete drop multiple tables in AWS athena - Edureka That is a super interesting answer, thanks for sharing Theo! rev2023.4.21.43403. descending order. Now you can also delete files from s3 and merge data: https://aws.amazon.com/about-aws/whats-new/2020/01/aws-glue-adds-new-transforms-apache-spark-applications-datasets-amazon-s3/. ORC files are completely self-describing and contain the metadata information. the set remains sorted after the skipped rows are discarded. using join_column requires When you delete a row, you remove the entire row. Each subquery must have a table name that can