WebJul 19, 2024 · Sorted by: 1. The Presto max () function returns the maximum value of all input values. Nulls won't affect that. Here's an example query that shows that NULLs are ignored: WITH t1 AS (SELECT 1 AS a), t2 AS (SELECT NULL AS a), tf AS ( SELECT * FROM t1 UNION ALL SELECT * FROM t2 ) SELECT max (a) FROM tf. WebAll null values in the original maps are coalesced to 0. multimap_agg(key, value) Returns a multimap created from the input key / value pairs. Each key can be associated with multiple values. Approximate Aggregate …
Functions in Amazon Athena - Amazon Athena
WebAthena supports complex aggregations using GROUPING SETS, CUBE and ROLLUP. GROUP BY GROUPING SETS specifies multiple lists of columns to group on. GROUP … WebisNull(salesAmount) The following are the given field values. 20.13 ( null ) 57.54. For these field values, the following values are returned. false true false. The following example tests for a NULL value in an ifelse statement, and returns a human-readable value instead. ifelse( isNull ({ActiveFlag}) , 'Inactive', 'Active') gold ingot prices
Aggregate Functions — Presto 0.280 Documentation
WebAug 11, 2024 · As a simple example let's take an Athena SQL Query that produces a table with column X containing NaN values (e.g. due to division by zero). When this table is exported to a csv file, NaN values are represented by "NaN" strings (i.e. different to NULL values which are represented by "" (empty) strings). WebAthena ignores these files when processing a query. For more information, see Athena cannot read hidden files . If all the files in your S3 path have names that start with an underscore or a dot, then you get zero records. WebThe IS NULL and IS NOT NULL operators test whether a value is null (undefined). Both operators work for all data types. Using NULL with IS NULL evaluates to true: select NULL IS NULL;-- true. But any other constant does not: SELECT 3. 0 IS NULL;-- false. IS DISTINCT FROM and IS NOT DISTINCT FROM# head edge lyt xr