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CREATE TABLE IF NOT EXISTS `b` (
  `cid` int(11) NOT NULL auto_increment,
  `username` varchar(25) NOT NULL,
  `Upassword` varchar(255) NOT NULL,
  `area` varchar(25) NOT NULL,
  `cost` int(255) NOT NULL,
  PRIMARY KEY  (`cid`)
)
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$sql="insert into a(cid,username,Upassword,area)
      select t1.cid,t1.username,t1.Upassword,t1.area from B.b t1";

PHP code:

$sql="insert into A.a(cid,username,Upassword,area)
select t1.cid,t1.username,t1.Upassword,t1.area from B.b t1";



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