1

我正在使用 DATE_ID 和 DATE_DESC 在 PostgreSQL 中构建时间维度表。我的 T-SQL（完美运行）脚本是：

set DATEFIRST 1
 ;WITH DATES AS (
    SELECT CAST('2019-01-01 00:00:00.000' AS datetime) AS [DATE]
    UNION ALL
    SELECT DATEADD(HH,1,[DATE])
    FROM DATES
    WHERE DATEADD(HH,1,[DATE]) <= CAST('2019-12-31' AS datetime)
)
SELECT
DATE_ID, DATE_DESC
from
(
SELECT  
CONVERT(int, CONVERT(char(8), DATE, 112)) AS DATE_ID,
DATE AS DATE_DESC
FROM
    DATES)a
order by 1
OPTION (MAXRECURSION 0)

目前，我试图将此代码转换为 PostgreSQL 可读的代码，但它不起作用。这是我目前的：

set EXTRACT(DOW FROM TIMESTAMP  '2019-01-01 00:00:00.000')+1
;WITH DATES AS (
    SELECT CAST('2019-01-01 00:00:00.000' AS timestamp) AS DATE
    UNION ALL
    SELECT CURRENT_DATE + INTERVAL '1 hour'
    FROM DATES
    WHERE CURRENT_DATE + INTERVAL '1 hour' <= CAST('2019-12-31' AS timestamp)
)

SELECT DATE_ID, DATE_DESC from
(SELECT  cast(to_char((DATE)::TIMESTAMP,'yyyymmddhhmiss') as BIGInt) AS DATE_ID,
DATE AS DATE_DESC
FROM
    DATES)a
order by 1
OPTION (MAXRECURSION 0)

我需要 2019-01-01 和 2019-12-31 之间的所有时间（24 小时）。目前我认为OPTION (MAXRECURSION 0)并set EXTRACT(DOW FROM TIMESTAMP '2019-01-01 00:00:00.000')+1不能正常工作。

4

1 回答 1

0

它是递归 CTE 的问题，在 Postgresql 中，您想要的查询将如下所示

WITH recursive DATES AS (
    SELECT CAST('2019-01-01 00:00:00.000' AS timestamp) AS date_
    UNION ALL
    SELECT date_ + INTERVAL '1 hour'
    FROM DATES
    WHERE date_ + INTERVAL '1 hour' <= CAST('2019-12-31' AS timestamp)
)

SELECT DATE_ID, DATE_DESC from
(SELECT  cast(to_char((date_)::TIMESTAMP,'yyyymmddhhmiss') as BIGInt) AS DATE_ID,
date_ AS DATE_DESC
FROM
    DATES)a
order by 1

演示

于 2021-03-10T09:17:11.057 回答