在Netezza基于其他列添加小时到Netezza的时间戳

Question

我正在Netezza SQL数据库中工作。我有2列：

• DATETIME1：具有交易的UTC时间的时间戳
• TIME_OFFSET：是一个整数，表示从UTC用户的时区的偏移量。例如，在UTC + 1的用户才有价值1

我想这样做是TIME_OFFSET列添加到DATETIME1列一个小时。

我创建了以下再现的例子：

SELECT * 
FROM ADMIN.INTEGRAL_ADSCIENCE_1845 

WITH my_table AS (
SELECT TIMESTAMP('2017-06-01 08:01:45') AS datetime1, 
    1 AS time_offset 
UNION 
SELECT TIMESTAMP('2017-06-01 08:03:45') AS datetime1, 
    2 AS time_offset 
) 
SELECT 
    DATETIME1, 
    TIME_OFFSET, 
    DATETIME1 + TIME_OFFSET AS simple_add, 
    DATETIME1 + INTERVAL '1 hour' AS add_one_hour 
FROM my_table; 

这产生以下输出：

+---------------------+-------------+------------+---------------------+ 
|  DATETIME1  | TIME_OFFSET | SIMPLE_ADD | ADD_ONE_HOUR  | 
+---------------------+-------------+------------+---------------------+ 
| 2017-06-01 08:01:45 |   1 | 2017-06-02 | 2017-06-01 09:01:45 | 
| 2017-06-01 08:03:45 |   2 | 2017-06-03 | 2017-06-01 09:03:45 | 
+---------------------+-------------+------------+---------------------+ 

但我想有是添加1小时，以第一行和2小时，以第二行。

我知道mysql的date_add()函数，但我仅限于Netezza不幸的。

Answer 1

这应该适合你。

WITH my_table AS (SELECT TIMESTAMP('2017-06-01 08:01:45') AS dttm 
          , 1 AS tm_offset 
         UNION 
        SELECT TIMESTAMP('2017-06-01 08:03:45') AS dttm 
          , 2 AS tm_offset) 
SELECT dttm 
     , tm_offset 
     , dttm + tm_offset AS simple_add 
     , dttm + CAST(tm_offset || ' hour' AS INTERVAL) 
    FROM my_table;