Question

需要将时间戳以1/1000秒分辨率转换为1/100分辨率。我可以为此目的使用to_char(timestamp, text)格式化功能，但是需要帮助才能使用text。 Postgres这样做的方法是here。

输入表（注意 - 此处的时间戳存储为varchar）

+-------------------------+
|       ms1000_val        |
+-------------------------+
| 2017/02/20 08:27:17.899 |
| 2017/02/20 08:23:43.894 |
| 2017/02/20 08:24:41.894 |
| 2017/02/20 08:28:09.899 |
+-------------------------+

输出表格

+------------------------+
|       ms100_val        |
+------------------------+
| 2017/02/20 08:27:17.89 |
| 2017/02/20 08:23:43.89 |
| 2017/02/20 08:24:41.89 |
| 2017/02/20 08:28:09.89 |
+------------------------+

Answer 1

试试这个

select cast(to_char(sub.field,'YYYY-MM-DD HH24:MI:SS') as timestamp) 
+ interval '10 millisecond' * (cast(to_char(sub.field,'MS') as integer)/10) as converted_value

from (
    select to_timestamp('2017/02/20 08:27:17.899','YYYY/MM/DD HH24:MI:SS.MS') as field
    union 
    select to_timestamp('2017/02/20 08:23:43.894','YYYY/MM/DD HH24:MI:SS.MS')
    union 
    select to_timestamp('2017/02/20 08:24:41.894','YYYY/MM/DD HH24:MI:SS.MS')
    union 
    select to_timestamp('2017/02/20 08:28:09.899','YYYY/MM/DD HH24:MI:SS.MS')
    ) sub

Netezza时间格式化

1 个答案: