Question

I have 5 tables. how to update one data that check if this data has not already exist in all the 5 tables.

I know something like INSERT ... ON DUPLICATE KEY UPDATE, but not find an example for multi-tables.

Now I use some poor query like:

mysql_query("UPDATE table1 SET image = '' WHERE image = '".$image."' ");
mysql_query("UPDATE table2 SET image = '' WHERE image = '".$image."' ");
mysql_query("UPDATE table3 SET image = '' WHERE image = '".$image."' ");
mysql_query("UPDATE table4 SET image = '' WHERE image = '".$image."' ");
mysql_query("UPDATE table5 SET image = '' WHERE image = '".$image."' ");
mysql_query("UPDATE table1 SET image = '".$image."' WHERE id = '".$id."'");

First update empty value for each table where the data is DUPLICATE then insert the value. this will cost more mysql connects I think… So how to use less query do this update? Thanks.

EDIT1: tried something below, it will update the value ignore to check if the value has already exited in one table of the five.

mysql_query("
UPDATE table1,table2,table3,table4,table5 
SET table1.image='".$image."' 
WHERE table1.id='".$id."' 
AND table1.image!='".$image."' 
AND table2.image!='".$image."' 
AND table3.image!='".$image."' 
AND table4.image!='".$image."' 
AND table5.image!='".$image."'
");

Answer 1

ok, i think this is what you asked for

update table1 AS t1
         LEFT JOIN table1 AS t1copy
           ON t1copy.image = '$image'       
   set t1.image = '$image'
 where t1.id = $id
   and t1copy.image IS NULL
   and not exists(select 1 from table2 where table2.image = '$image' )
   and not exists(select 1 from table3 where table3.image = '$image' )