just use a nested select. not tested, but this should work: UPDATE Stores Set Order = (SELECT (MAX(Order) + 1) FROM Stores LIMIT 1) WHERE Order = 0;
----- Original Message ----- From: "Super Steve" <[email protected]> To: "NZ PHP Users Group" <[email protected]> Sent: Tuesday, December 01, 2009 11:29 AM Subject: [phpug] Re: Rotating Items on a Daily Basis? Hmmm... UPDATE Stores Set Order = MAX(Order) + 1 WHERE Order = 0; Results in Error #1111 - Invalid use of group function Note sure why.... On Dec 1, 10:13 am, Simon J Welsh <[email protected]> wrote: > One way would be to add a column to the table, say Order, with values from > 1 to max. Then, using a crontab or some such, UPDATE Stores SET Order = > Order - 1; UPDATE Stores Set Order = MAX(Order) + 1 WHERE Order = 0; > > Grab the stores sorted by Order. > > On 1/12/2009, at 10:09 AM, Super Steve wrote: > > > > > > > I've got a client that wants to display on his website a list of > > retail stores that stock his products. To facilitate this we have all > > of the store details in a MySQL database. > > > But rather than display all of the stores in alphabetical or location > > order, my client wants to rotate the stores so each one gets a turn at > > being at the top. The idea is that at the beginning of each day the > > store that was on the top yesterday will move to the bottom and all > > the other stores move up one. For the rest of the day the stores are > > displayed in this order, i.e they maintain their positions for the > > whole day. Then next day the top one goes to the bottom and they all > > move up one. > > > Does anyone have any idea on how I can achieve this? I'm not looking > > for actual PHP code, just pseudo code to get me on the right track. > > > -- > > NZ PHP Users Group:http://groups.google.com/group/nzphpug > > To post, send email to [email protected] > > To unsubscribe, send email to > > [email protected] > > --- > Simon Welsh > Admin ofhttp://simon.geek.nz/ > > Who said Microsoft never created a bug-free program? The blue screen > never, ever crashes! > > http://www.thinkgeek.com/brain/gimme.cgi?wid=81d520e5e -- NZ PHP Users Group: http://groups.google.com/group/nzphpug To post, send email to [email protected] To unsubscribe, send email to [email protected] -- NZ PHP Users Group: http://groups.google.com/group/nzphpug To post, send email to [email protected] To unsubscribe, send email to [email protected]
