Re: [SQL] Bad date representation

At 12:25 +0300 on 09/07/1999, Roland_DUBOULOZ wrote:


> 2.-postmaster -i
>
>   insert into FOO values('06-22-1999');
>   insert into FOO values('06-07-1999');
>   insert into FOO values('23-06-1999');  <---- no ERROR
>    WE Have NO ERROR !!!!! why ???
>
> and on select * from FOO the result is
>
>     date
>   ----------
>   06-22-1999
>   06-07-1999
>   06-23-1999

The way Postgres parses dates is: first, see if there is more than one way
to interpret the date. If there is more than one way, use the DateStyle.

So, if it sees a date like 23-06-1999, there is only one way to interpret
it - that the 23 is the day, and the 06 is the month. In that case, this is
June 23rd, and everything is OK. But a date like 08-06-1999 could be either
August sixth or June eighth. In that case, it uses the DateStyle to
determine which.

This algorithm gives you some lenience.

Herouth

--
Herouth Maoz, Internet developer.
Open University of Israel - Telem project
http://telem.openu.ac.il/~herutma