If he is not sure what a join or primary key is then I do not think a correct solution for anything he is working on would involve a trigger. In October '07 Baron Schwartz said the following: "I'm not an expert on them, but as a side note: I personally don't use triggers in MySQL. I consider them rather poorly implemented in MySQL 5 and I'm afraid of them breaking replication, or doing something else I don't like. When we took a look at them at my employer, we found basic things wrong with them, like this:
http://bugs.mysql.com/bug.php?id=19686 Therefore I do not trust them at all, and that's why I don't know a whole lot about how to use them :)" Which is a good enough reason for me to not use them. On Thu, Feb 28, 2008 at 1:10 PM, Lyons, Jim <[EMAIL PROTECTED]> wrote: > Jason Pruim wrote: > > > I am attempting to write a PHP application that reads info from a > > MySQL database, and I'm wondering if I can set up a column in one > > table that gets it's info from a field in another table automatically? > > > Ie: > > > Table1: > > field1 > > field2 > > field3 > > > Table2: > > field4 > > field5 > > field6 = field1 > > All the responses have approached this as a join problem. But if you > want a field in a table to equal the data in a field in another table > (field6 = field1) then perhaps what you really need is a trigger on > Table2 that will grab data out of Table1 on insert into Table2, or > change data in Table2 on update to Table1. > > Jim Lyons > > > ----- > Jim Lyons > MySQL DBA > Hoover's, Inc. > 512-380-4780 > [EMAIL PROTECTED] > > > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > > -- Rob Wultsch (480)223-2566 [EMAIL PROTECTED] (email/google im) wultsch (aim) [EMAIL PROTECTED] (msn) -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
