無法在Redshift上使用JOG與generate_series

Redshift上的generate_series函數在按照預期工作時用於簡單的select語句。無法在Redshift上使用JOG與generate_series

WITH series AS (
    SELECT n as id from generate_series (-10, 0, 1) n 
) SELECT * FROM series; 
-- Works fine

只要我添加JOIN條件，紅移拋出

com.amazon.support.exceptions.ErrorException：功能 generate_series（整數，整數，整數）「不支持」

DROP TABLE testing; 
CREATE TABLE testing (
    id INT 
); 
WITH series AS (
    SELECT n as id from generate_series (-10, 0, 1) n 
) SELECT * FROM series S JOIN testing T ON S.id = T.id; 
-- Function "generate_series(integer,integer,integer)" not supported.

紅移版本

SELECT version(); 
-- PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.1485

有沒有任何解決方法可以使這項工作？

來源

2017-10-16 Rahul

你是對的，這在Redshift上不起作用。請參閱here。

最簡單的解決方法是事先用該表中的值「手動」創建一個永久表，例如，你可以使用該表爲-1000行+1000，然後從該表中選擇範圍，

因此，對於你的榜樣，你會碰到這樣的

WITH series AS (
    SELECT n as id from (select num as n from newtable where num between -10 and 0) n 
) SELECT * FROM series S JOIN testing T ON S.id = T.id;

爲你做這項工作？

或者，如果您不能創建表事先或不喜歡，你可以使用類似這樣

with ten_numbers as (select 1 as num union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9 union select 0) 
,generted_numbers AS 
(
    SELECT (1000*t1.num) + (100*t2.num) + (10*t3.num) + t4.num-5000 as gen_num 
    FROM ten_numbers AS t1 
     JOIN ten_numbers AS t2 ON 1 = 1 
     JOIN ten_numbers AS t3 ON 1 = 1 
     JOIN ten_numbers AS t4 ON 1 = 1 
) 
select gen_num from generted_numbers 
where gen_num between -10 and 0 
order by 1;

來源

2017-10-16 23:00:20

generate_series不紅移支持。它只能在領導者節點上獨立工作。

一種解決方法是使用row_number針對具有足夠數量的行中的任何表：

with 
series as (
    select (row_number() over())-11 from some_table limit 10 
) ...

也，這個問題被問多次已經

來源

2017-10-16 23:28:10 AlexYes

無法在Redshift上使用JOG與generate_series

回答

相關問題