March 2021
Intermediate to advanced
265 pages
6h 50m
Chinese
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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 ...