Dates in MySQL queries

[Mark Stevens]

I am trying to do select all of the records in a table where they data
has not expired.

The table contains two fields Subject (varchar(100)) and ExpiryDate
(Date).

I am getting all of the records returned when I execute:

$sql = "select * from tbl where ExpiryDate > " . date("Y-m-d");
mysql_query($sq l);

The expiry date in the record I am looking at is 2004-03-25 and the
query that is being executed is:

select * from tbl where ExpiryDate > 2004-03-28

What am I missing? Can anyone recommend a good site to look at that
discusses dates in MySQL queries?

Thanks in advance,
Mark
--
|\ _,,,---,,_ A picture used to be worth a
ZZZzzz /,`.-'`' -. ;-;;, thousand words - then along
|,4- ) )-,_. ,\ ( `'-' came television!
'---''(_/--' `-'\_)

Mark Stevens (mark at thepcsite fullstop co fullstop uk)

[Andy Hassall]

Re: Dates in MySQL queries

On Sun, 28 Mar 2004 16:54:52 +0100, Mark Stevens <read@my.sig> wrote:
[color=blue]
>I am trying to do select all of the records in a table where they data
>has not expired.
>
>The table contains two fields Subject (varchar(100)) and ExpiryDate
>(Date).
>
>I am getting all of the records returned when I execute:
>
> $sql = "select * from tbl where ExpiryDate > " . date("Y-m-d");
> mysql_query($sq l);
>
>The expiry date in the record I am looking at is 2004-03-25 and the
>query that is being executed is:
>
>select * from tbl where ExpiryDate > 2004-03-28
>
>What am I missing?[/color]

Quotes.

2004-03-28 is an arithmetic expression which equals 1978. This isn't a valid
date representation, so it either gets silently turned into the zero-date
0000-00-00, which is less than all the dates in your table, or they're both
turned into strings and compared, which still gives the same result. (I don't
know off the top of my head which approach MySQL takes in this case).

Whereas '2004-03-28' is a string representation of a date, which MySQL can use
to compare with a date field.
[color=blue]
>Can anyone recommend a good site to look at that
>discusses dates in MySQL queries?[/color]

http://www.mysql.com/documentation/m...e_calculations
http://www.mysql.com/documentation/m...and_time_types
http://www.mysql.com/documentation/m...time_functions
http://www.mysql.com/documentation/m...tml#Using_DATE

--
Andy Hassall <andy@andyh.co. uk> / Space: disk usage analysis tool
http://www.andyh.co.uk / http://www.andyhsoftware.co.uk/space

[Andy Hassall]

Re: Dates in MySQL queries

On Sun, 28 Mar 2004 17:05:51 +0100, Andy Hassall <andy@andyh.co. uk> wrote:
[color=blue]
>2004-03-28 is an arithmetic expression which equals 1978.[/color]

1973, even. Bleh :-p

--
Andy Hassall <andy@andyh.co. uk> / Space: disk usage analysis tool
http://www.andyh.co.uk / http://www.andyhsoftware.co.uk/space

[Mark Stevens]

Re: Dates in MySQL queries

On Sun, 28 Mar 2004 17:05:51 +0100, Andy Hassall <andy@andyh.co. uk>
wrote:
[color=blue]
> Quotes.
>
> 2004-03-28 is an arithmetic expression which equals 1978. This isn't a valid[/color]

Thanks, works fine now.

Regards,
Mark
--
|\ _,,,---,,_ A picture used to be worth a
ZZZzzz /,`.-'`' -. ;-;;, thousand words - then along
|,4- ) )-,_. ,\ ( `'-' came television!
'---''(_/--' `-'\_)

Mark Stevens (mark at thepcsite fullstop co fullstop uk)