March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
Content preview from Presto实战
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134
｜
第
8
章
SELECT TIMESTAMP '1983-10-19 07:30:05.123 America/New_York' AT TIME ZONE 'UTC';
_col0
----------------------------
1983-10-19 11:30:05.123 UTC
(1 row)
2.
时间间隔
如表
8-13
和表
8-14
所示，数据类型
INTERVAL
可以是
YEAR TO MONTH
或
DAY TO SECOND
。
表8-13：
YEAR TO MONTH
的时间间隔
YEAR TO MONTH
INTERVAL '<years>-<months>' YEAR TO MONTH
INTERVAL '<years>' YEAR TO MONTH
INTERVAL '<years>' YEAR
INTERVAL '<months>' MONTH
表8-14：
DAY TO SECOND
的时间间隔
DAY TO SECOND
INTERVAL '<days> <time>' DAY TO SECOND
INTERVAL '<days>' DAY TO SECOND
INTERVAL '<days>' DAY
INTERVAL '<hours>' HOUR
INTERVAL '<minutes>' MINUTE
INTERVAL '<seconds>' SECOND
下面的例子展示了我们介绍过的一些行为：
SELECT INTERVAL '1-2' YEAR TO MONTH;
_col0 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.