时间表SQL Presto

Question

我需要在宝藏数据中使用临时时间范围表来查询我的SQL查询：

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);

我能在Presto这样做什么？

Answer 1

Pro tipp，您甚至可以使用WITH语法在没有临时表的情况下离开。 然后在下面的SELECT语句中，您可以使用hours ，就好像它是一个表。

WITH hours AS (SELECT * FROM UNNEST(ARRAY[0,1, ... 22,23]) AS t (hour))
SELECT 
    * 
FROM 
    hours
;

Answer 2

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
;

Answer 3

根据您的Presto版本，尝试：

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

要么

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功能，而不是在Presto中提供临时表。