weetat wrote:
Hi all,
I would like to say good job to this newsgroup , they are the best.
Ok. My dilemma is that i have to compare values between 2 table which
are exactly the same structure and fields.
Below is rough example .
The table are tbl_chassis and tbl_chassis_temp. Below are the fields.
`id` int(11) NOT NULL auto_increment,
`serial_no` varchar(100) NOT NULL default '',
`host_name` varchar(100) NOT NULL default '',
`chasis_model` varchar(100) NOT NULL default '',
`chasis_flash_size` varchar(100) NOT NULL default '',
`chasis_dram_size` varchar(100) NOT NULL default '',
`chasis_sw_version` varchar(100) NOT NULL default '',
`chasis_eos` date NOT NULL default '-00-00',
`chasis_eol` date NOT NULL default '-00-00',
`chasis_user_field_1` varchar(100) NOT NULL default '',
`chasis_user_field_2` varchar(100) NOT NULL default '',
`chasis_user_field_3` varchar(100) NOT NULL default '',
`status` varchar(100) NOT NULL default '',
What i need to figure out are when the records are deleted , updated and
insert ,i need to update status in tbl_chassis table. What i am plan to
do is to select query in the tbl_chassis_temp table and compare the
value from each records to the records in the tbl_chassis table.Any
others ways to do it?
If you're changing the status, why not do it in both tables at the same
time?
$query = update table1 set status=newstatus where ...;
mysql_query($query);
$query = update table2 set status=newstatus where ...;
mysql_query($query);
Another option is to change to use the INNODB engine in mysql and use
foreign keys (note they only work properly with InnoDB tables, MyISAM
tables don't have this capability).
See
http://dev.mysql.com/doc/refman/5.1/en/innodb.html
http://dev.mysql.com/doc/refman/5.1/en/example-foreign-keys.html
http://dev.mysql.com/doc/refman/5.1/en/ansi-diff-foreign-keys.html
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