PostgreSQL 的时间戳小时差异 [英] Timestamp Difference In Hours for PostgreSQL

问题描述

是否有 TIMESTAMPDIFF() 等效于 PostgreSQL?

Is there a TIMESTAMPDIFF() equivalent for PostgreSQL?

我知道我可以减去两个时间戳来得到一个 postgresql INTERVAL.我只想要一个 INT 表示的两个时间戳之间的差异(以小时为单位).

I know I can subtract two timestamps to get a postgresql INTERVAL. I just want the difference between the two timestamps in in hours represented by an INT.

我可以在 MySQL 中这样做:

I can do this in MySQL like this:

TIMESTAMPDIFF(HOUR, links.created, NOW())

我只需要以整数表示的两个时间戳之间的差异.

I just need the difference between two timestamps in hours represented as an integer.

解决方案适合我:

SELECT "links_link"."created",
"links_link"."title",
(EXTRACT(EPOCH FROM current_timestamp - "links_link"."created")/3600)::Integer AS "age" 
FROM "links_link"

推荐答案

弹出的第一件事

EXTRACT(EPOCH FROM current_timestamp-somedate)/3600

可能不漂亮，但可以畅通无阻.如果定义了区间除以区间可能会更漂亮.

May not be pretty, but unblocks the road. Could be prettier if division of interval by interval was defined.

编辑:如果您希望它大于零，请使用 abs 或 best(...,0).适合您的意图.

Edit: if you want it greater than zero either use abs or greatest(...,0). Whichever suits your intention.

Edit++:我没有使用 age 的原因是 age 带有一个参数，引用文档:从 current_date 中减去(午夜).这意味着除非在午夜跑步，否则您不会得到准确的年龄".现在已经快凌晨 1 点了:

Edit++: the reason why I didn't use age is that age with a single argument, to quote the documentation: Subtract from current_date (at midnight). Meaning you don't get an accurate "age" unless running at midnight. Right now it's almost 1am here:

select age(current_timestamp);
       age        
------------------
 -00:52:40.826309
(1 row)

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