CREATE TABLE entries ( id serial NOT NULL,title character varying,load_sequence integer );
和数据
INSERT INTO entries(title,load_sequence) VALUES ('A',1); INSERT INTO entries(title,2); INSERT INTO entries(title,3); INSERT INTO entries(title,6); INSERT INTO entries(title,load_sequence) VALUES ('B',4); INSERT INTO entries(title,5); INSERT INTO entries(title,7); INSERT INTO entries(title,8);
Postgresql中是否有一种方法可以编写sql,在按load_sequence对它们进行排序后,它们按相同的标题段对数据进行分组.
我的意思是:
=# SELECT id,title,load_sequence FROM entries ORDER BY load_sequence; id | title | load_sequence ----+-------+--------------- 9 | A | 1 10 | A | 2 11 | A | 3 13 | B | 4 14 | B | 5 12 | A | 6 15 | B | 7 16 | B | 8
我想要小组:
=# SELECT title,string_agg(id::text,',' ORDER BY id) FROM entries ???????????;
结果将是:
title | string_agg -------+------------- A | 9,10,11 B | 13,14 A | 12 B | 15,16
解决方法
原文地址:https://www.jb51.cc/mssql/78233.html
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