Re: Using DateDiff with Postgres

Bruce, Tom, Etc:

This question comes up so often. Can't we have a FAQ about it
somewhere?

Jeff,

> Hi there. I was wondering if anyone can tell me the correct syntax
> for
> using DateDiff for postgrees. I'm using MI (or mi) for minute and I
> keep getting attribute 'mi' not found.

Datediff is not a SQL function. It is a MICROSOFT function, due to MS's
poor implementation of data types.

In PostgreSQL, you simply add and subtract interval values to datetime
values:

'2001-06-27 14:43:21'::DATETIME - '00:10:00'::INTERVAL = '2001-06-27
14:33:21'::DATETIME

'2001-06-27 14:43:21'::DATETIME - '2001-06-27 14:33:21'::DATETIME =
'00:10:00'::INTERVAL

For more information, see "Functions and Operators" in the PostgreSQL
online docs.

-Josh Berkus

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