WebDec 19, 2024 · The PostgreSQL ARRAY_AGG function can be used for string aggregation, but we need to make another call on top of it to convert the aggregation result set from ARRAY to STRING with the ARRAY_TO_STRING function. WebApr 13, 2024 · I've been able to retrieve all conversation_message s linked to each conversation with the following query: select c.id as listing_conversation_id, to_jsonb (array_agg (cm.*)) as messages -- to_json ( -- select * -- from my_schema.conversation_message -- limit 1 -- ) as latest_message from …
如何删除由array_agg postgres函数生成的重复数据? - IT宝库
WebThe gp_array_agg module introduces a parallel array_agg () aggregate function that you can use in Greenplum Database. The gp_array_agg module is a Greenplum Database extension. Installing and Registering the Module The gp_array_agg module is installed when you install Greenplum Database. WebOct 6, 2024 · I am trying to use ARRAY_AGG with ORDINAL to select only the first two "Action"s for each user and restructure as shown in TABLE 2. SELECT UserId, ARRAY_AGG ( STRUCT (A.Action, A.Visit, A.Order) ORDER BY A.Visit, A.Order, A.Action ) FROM `table` LEFT JOIN UNNEST (A) AS A GROUP BY UserId Table 1: (Sample … hilda weston
Получаем структурированные данные из PostgreSQL / Хабр
WebGreenplum database - GPDB. Greenplum Database is a massively parallel processing (MPP) database server based on PostgreSQL open-source technology. MPP (also … Webarray 构造函数无法工作且需要 array\u agg 的情况?构造函数能够替换我所有的 array\u agg 。是否有一个等效的json构造函数可以简化或替换 json_agg ?@user779159:Yes:同一 SELECT 列表中的多个数组聚合,每个聚合排序顺序可能不同。)json:no,但您可以使用` to_jsonb(array WebAug 10, 2012 · With SELECT array ( SELECT id FROM table ); you will get a result like: {1,2,3,4,5,6} Then, if you wish to remove the {} signs, you can just use the array_to_string () function and use comma as separator, so: SELECT array_to_string ( array ( SELECT id FROM table ), ',' ) will get a result like: 1,2,3,4,5,6 Share Improve this answer Follow hilda wheelwright