将数组从一个表插入另一个表

Question

恐怕这听起来多余。我已经尽了我的努力，并至少取代了我迄今发现的三个想法，但没有任何成效。

目标是合并来自两个表格的唯一字段，但是现在我甚至无法从一个表格获取完全相同的字段，并将其创建为相同的表格。这里是迄今为止的代码，与我的意见：

$result = mysql_query("SELECT * from $db.$tbl LIMIT 50"); 

if($result) { 
while($maindata = mysql_fetch_assoc($result)) { 

$newdata = implode ("," , $maindata); 

$newdata = mysql_escape_string($newdata); 

$pop = "INSERT INTO $db.address_new (id,entitynum,address,city,state,zip,country,remarks) 
SELECT FROM $db.address";   

//This is the original code replaced by the above 
//$pop = "INSERT INTO $db.address_new (id,entitynum,address,city,state,zip,country,remarks) 
// VALUES ($newdata)"; 

mysql_query($pop); 

//print_r($pop); 
    //Seems to give the correct output in the browser, but the table address_new remains empty. ` 

在此先感谢您。我非常感谢你的帮助。

Answer 1

要直接从另一个表中插入（注：如果ID是你可能会或可能不希望将其插入这样的auto_increment）：

INSERT INTO db.address_new (id,entitynum,address,city,state,zip,country,remarks) 
    SELECT (id,entitynum,address,city,state,zip,country,remarks) 
     FROM db.address LIMIT 50 

（不要把这个在一个循环中）

如果你正在寻找独特的价值观，你可以通过几种方法做到这一点。就个人而言，我将有一个独特的密钥（或一组）的值，然后就去做INSERT IGNORE：

INSERT IGNORE INTO db.address_new 
    (id,entitynum,address,city,state,zip,country,remarks) 
    SELECT (id,entitynum,address,city,state,zip,country,remarks) 
     FROM db.address LIMIT 50 

补充说明：

// use mysql_real_escape_string 
mysql_escape_string($newdata); 

// since you're passing this through PHP, you need to make sure to quote 
// all of your values. This probably means you'll need to loop and replace this 
// $newdata = implode ("," , $maindata); 
// with something like: 

$newdata = array(); 
foreach($maindata as $column) 
{ 
    $newdata[] = "'" . mysql_real_escape_string($column) . "'"; 
} 
$newdata = implode(',', $newdata); 


// you're missing the columns in your select clause. 
$pop = "INSERT INTO $db.address_new ". 
     "(id,entitynum,address,city,state,zip,country,remarks) ". 
     // You need to select *something* 
     "SELECT FROM $db.address";