Athena with clause example. You can't use a WITH clause in a subquery and reference its table in the FROM clause of the main query or another subquery. For examples of CTAS queries, see Examples of CTAS queries. For information about using SQL that is specific to Athena, see Considerations and limitations for SQL queries in Amazon Athena and Run SQL queries in Amazon Athena. CTAS queries are useful when you want to transform data that you regularly query. For example, you can specify a maximum of only 100 new partit Jan 15, 2022 · AWS Athena (Presto) - multiple WITH statements Ask Question Asked 4 years, 1 month ago Modified 4 years, 1 month ago Dec 29, 2025 · In this blog, we’ll demystify why reusing subqueries via `WITH` clauses drives high data scanned in Athena, walk through real-world examples, and provide actionable strategies to avoid this issue. Apr 28, 2020 · Data is the lifeblood of a digital business and a key competitive advantage for many companies holding large amounts of data in multiple cloud regions. Jan 15, 2022 · AWS Athena (Presto) - multiple WITH statements Ask Question Asked 4 years, 1 month ago Modified 4 years, 1 month ago Optimize top N queries The ORDER BY clause returns the results of a query in sorted order. Imperva protects web applications and data assets, and in this post we examine how you can use SQL to analyze big data directly, or to pre-process the data for further analysis by machine learning. By default, Athena serializes Amazon Ion results in Ion binary format, but you can also use text format. Keep in mind that CTAS queries do have some limitations. how could I use sql 'case when' correctly in Athena Ask Question Asked 5 years, 3 months ago Modified 5 years, 3 months ago This section provides guidance for running Athena queries on common data sources and data types using a variety of SQL statements. c2 and. c1 and aw. Creates a literal inline table. day from aw left join f on aw. This topic provides summary information for reference. Feel free to check on industrial Oracle SQL using WITH and AWS Athena SQL UNPIVOT : CROSS JOIN UNNEST, SQL WITH clause. Dec 13, 2019 · Example – Return records from the last 24 hours The following query uses a filter in the WHERE clause to return the HTTP source name, HTTP source ID, and HTTP request fields for records from the last 24 hours. location = 'LHR3' Athena SQL Query Examples for ALB troubleshooting Devops Junction Athena Query Where Clause This section provides guidance for running athena queries on common data sources and data types using a variety of sql statements. Also, avoid adding ORDER BY to inner queries if they are not strictly necessary. "table84" where table84. Problem definition Let's define the following problem The following examples show CREATE TABLE AS SELECT queries for partitioned tables in different storage formats, using partitioned_by, and other properties in the WITH clause. SELECT * FROM "default". Feb 14, 2022 · I am trying to run query on Athena which is not behaving as expected: select distinct aw. Synopsis Athena tutorial covers creating database, table from sample data, querying table, checking results, using named queries, keyboard shortcuts, typeahead suggestions, connecting other data sources. year, aw. General guidance is provided for working with common structures and operators—for example, working with arrays, concatenating, filtering, flattening, and sorting. The WHERE clause in SQL is essential for filtering data in AWS Athena, allowing users to retrieve specific datasets based on conditions. To use text format, specify ion_encoding = 'TEXT' in the CTAS WITH clause, as in the following example. c2 and For example, you can reference such a table in the FROM clause of a subquery in the SELECT list, WHERE clause, or HAVING clause. c2 = f. Mar 28, 2024 · Introduction A common industrial flow of data analysis consists of : data preparation data aggregation data join data output In this guide I will show how to implement efficiently data preparation, aggregation and output. The table can be anonymous, or you can use the AS clause to specify a table name, column names, or both. If you don't strictly need your result to be sorted, avoid adding an ORDER BY clause. month, aw. Comprehensive information about using SELECT and the SQL language is beyond the scope of this documentation. c1= f. You'll also learn about the benefits and I am assuming location datatype is varchar, so use single quote instead of "". Athena uses distributed sort to run the sort operation in parallel on multiple nodes. For an example of creating a database, creating a table, and A CTAS query creates a new table from the results of a SELECT statement in another query.