Re: [SQL] datediff?

[Josh Berkus]

Erwin,

> I read your FAQ: Working with Dates and Times in PostgreSQL with
> interest
> and was wondering if somebody came up with those datediff and dateadd
> functions?
> I couldn't find any at techdocs.postgresql.org.

I know somebody worked on one.  I take it you read the articles on SQL
Server ---> PostgreSQL conversion?  

The problem, as I recall, was one of quoted identifiers.  That is, for
datediff, you do:

DATEDIFF ( m, date1, date2 )

whereas a postgresql function would have to say

DATEDIFF ( 'm', date1, date2 )

I don't know if anyone ever worked out a way around this minor problem.

-Josh


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Re: [SQL] datediff?

[Josh Berkus]

Erwin,

> Thanks for your quick response Josh.
> 
> I wasn't aware of the Postgresql-function DATEDIFF()
> The accolade ' is not a problem of course!

Whoops!   Didn't want to confuse you.   What I meant was, a PgSQL
function "Datediff" could be easily *written*, except that it would
need quoted identifiers, different from the T-SQL function.   If anyone
on this list has written a DateDiff, please post!

> But I have to say to my shame, I was asking you too soon, because all
> I
> really needed was a function that could return me some absolute
> timediff,
> and I found date_part('epoch', date) does the trick nicely enough for
> me.
> I can now take the diff in millisecs since start of epoch, which is
> enough
> to do all other calculations easily.

Cool!   Glad that you found something that would work for you.

-Josh

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