6

我需要在宝藏数据 presto 中为我的 SQL 查询使用一个临时时间范围表:

CREATE TEMPORARY TABLE fakehours (Hour BIGINT);

INSERT INTO Hour VALUES (0);
INSERT INTO Hour VALUES (1);
INSERT INTO Hour VALUES (2);
INSERT INTO Hour VALUES (3);
INSERT INTO Hour VALUES (4);
INSERT INTO Hour VALUES (5);
INSERT INTO Hour VALUES (6);
INSERT INTO Hour VALUES (7);
INSERT INTO Hour VALUES (8);
INSERT INTO Hour VALUES (9);
INSERT INTO Hour VALUES (10);
INSERT INTO Hour VALUES (11);
INSERT INTO Hour VALUES (12);
INSERT INTO Hour VALUES (13);
INSERT INTO Hour VALUES (14);
INSERT INTO Hour VALUES (15);
INSERT INTO Hour VALUES (16);
INSERT INTO Hour VALUES (17);
INSERT INTO Hour VALUES (18);
INSERT INTO Hour VALUES (19);
INSERT INTO Hour VALUES (20);
INSERT INTO Hour VALUES (21);
INSERT INTO Hour VALUES (22);
INSERT INTO Hour VALUES (23);

我可以像这样在 Presto 中做什么?

4

3 回答 3

4

专业提示,您甚至可以在没有使用该WITH语法的临时表的情况下逃脱。然后在下面的SELECT语句中,您可以像使用hours表格一样使用它。

WITH hours AS (SELECT * FROM UNNEST(ARRAY[0,1, ... 22,23]) AS t (hour))
SELECT 
    * 
FROM 
    hours
;
于 2016-11-18T11:59:54.743 回答
3

我会这样做:

CREATE TABLE fakehours AS
WITH hours AS (
SELECT * FROM UNNEST(SEQUENCE(0,23,1)) AS t (hour)
)
SELECT   * 
FROM hours
;
于 2017-03-08T22:00:36.403 回答
2

根据您的 Presto 版本尝试:

SELECT * FROM UNNEST(SEQUENCE(0,23))

或者

SELECT * FROM UNNEST(ARRAY[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23])

应该在连接中实现您想要的,而不是在 Presto 中提供临时表。

于 2016-06-22T13:05:21.710 回答