我们真的不喜欢在 StackOverflow 上提供完整的代码解决方案，通常我们会帮助您编写自己的解决方案，但我不确定是否可以在不亲自编写代码的情况下解释所有步骤以解决问题，所以这里有一些入门代码。
这是未经测试的原始代码
首先复制您现有的表格，直到我们知道此代码不会损害或丢弃您现有的数据，然后在副本上执行所有操作，然后在完成后处理出来，您已经验证它可以正常工作，然后将其应用到正确的表中。
使用以下命令创建副本：
CREATE TABLE EmailListCopy LIKE EmailList;
INSERT EmailListCopy SELECT * FROM EmailList;
PHP 代码：
<?php
//This script will first query the table for ALL results, store them in arrays,
//then loop through the arrays to search the table for duplicates using individual
//sql queries and then compare the results, update the entry as needed and delete the
//duplicate row. THIS CODE IS NOT OPTIMIZED!! DO NOT RUN CONTINUOUSLY!! This should be
//used for OCCASIONAL merging ONLY!! i.e. Once-a-day or once-a-week etc...
$result="";
$duplicatesFound;
//Setup arrays to hold the original query information
$autoidArray = array();
$titleArray = array();
$lastnameArray = array();
$firstnameArray = array();
$middlenameArray = array();
$prefixArray = array();
$fulladdressArray = array();
$address1Array = array();
$address2Array = array();
$cityArray = array();
$stateArray = array();
$zipArray = array();
$countryArray = array();
$countyArray = array();
$phone1Array = array();
$phone2Array = array();
$emailArray = array();
$idArray = array();
$tsArray = array();
$link=mysqli_connect($hostname,$dbname,$password,$username);
if(mysqli_connect_errno())
{
$result="Error connecting to database: ".mysqli_connect_error();
}
else
{
$stmt=mysqli_prepare($link,"SELECT autoid,title,lastname,firstname,middlename,prefix,fulladdress,address1,address2,city,state,zip,country,county,phone1,phone2,email,id,ts FROM " . $table);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt, $autoid, $title, $lastname, $firstname, $middlename, $prefix, $fulladdress, $address1, $address2, $city, $state, $zip, $country, $county, $phone1, $phone2, $email, $id, $ts);
if(mysqli_stmt_errno($stmt))
{
$result="Error executing SQL statement: ".mysqli_stmt_error($stmt);
}
else
{
mysqli_stmt_store_result($stmt);
if(mysqli_stmt_num_rows($stmt)==0)
{
$result="0 rows returned (Empty table)";
}
else
{
while(mysqli_stmt_fetch($stmt))
{
//Load results into arrays
array_push($autoidArray, $autoid);
array_push($titleArray, $title);
array_push($lastnameArray, $lastname);
array_push($firstnameArray, $firstname);
array_push($middlenameArray, $middlename);
array_push($prefixArray, $prefix);
array_push($fulladdressArray, $fulladdress);
array_push($address1Array, $address1);
array_push($address2Array, $address2);
array_push($cityArray, $city);
array_push($stateArray, $state);
array_push($zipArray, $zip);
array_push($countryArray, $country);
array_push($countyArray, $county);
array_push($phone1Array, $phone1);
array_push($phone2Array, $phone2);
array_push($emailArray, $email);
array_push($idArray, $id);
array_push($tsArray, $ts);
}
}
mysqli_stmt_free_result($stmt);
}
for($i=0;$i<count($emailArray);$i++)
{
$duplicatestmt=mysqli_prepare($link,"SELECT autoid,title,lastname,firstname,middlename,prefix,fulladdress,address1,address2,city,state,zip,country,county,phone1,phone2,email,id,ts FROM " . $table . " WHERE email=? OR phone1=?");
mysqli_stmt_bind_param($duplicatestmt, 'si', $emailArray[$i], $phone1Array[$i]);
mysqli_stmt_execute($duplicatestmt);
mysqli_stmt_bind_result($duplicatestmt, $autoid, $title, $lastname, $firstname, $middlename, $prefix, $fulladdress, $address1, $address2, $city, $state, $zip, $country, $county, $phone1, $phone2, $email, $id, $ts);
if(mysqli_stmt_errno($duplicatestmt))
{
$result="Error executing SQL statement: ".mysqli_stmt_error($duplicatestmt);
}
else
{
mysqli_stmt_store_result($duplicatestmt);
if(mysqli_stmt_num_rows($duplicatestmt)==0)
{
//NO Duplicate entry found, loop again;
echo "<p>No Dublicate Found</p>";
}
else
{
while(mysqli_stmt_fetch($duplicatestmt))
{
//Found a duplicate
echo "<p>Dublicate Found</p>";
if($autoid > $autoidArray[$i])
{
if($email=="" && $phone1=="")
{
echo "<p>Both email and phone1 are empty. Skipping...</p>";
else
{
$duplicatesFound++;
//The autoid of the duplicate just found is greater then the autoid of the
//one used to find the duplicate (older). Therefor update the entry and remove the
//duplicate
//
//This checks each of the values and if the lower autoid one is blank, then will add the
//value to the table in the lower autoid row
//NOTE:** If having any problems with the queries below try removing the single quotes -> ' <- from any "autoid=" portion of the query
if($titleArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$title."' WHERE autoid='".$autoidArray[$i]."'");}
if($lastnameArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$firstname."' WHERE autoid='".$autoidArray[$i]."'");}
if($firstnameArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$lastname."' WHERE autoid='".$autoidArray[$i]."'");}
if($middlenameArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$middlename."' WHERE autoid='".$autoidArray[$i]."'");}
if($prefixArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$prefix."' WHERE autoid='".$autoidArray[$i]."'");}
if($fulladdressArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$fulladdress."' WHERE autoid='".$autoidArray[$i]."'");}
if($address1Array[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$address1."' WHERE autoid='".$autoidArray[$i]."'");}
if($address2Array[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$address2."' WHERE autoid='".$autoidArray[$i]."'");}
if($cityArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$city."' WHERE autoid='".$autoidArray[$i]."'");}
if($stateArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$state."' WHERE autoid='".$autoidArray[$i]."'");}
if($zipArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$zip."' WHERE autoid='".$autoidArray[$i]."'");}
if($countryArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$country."' WHERE autoid='".$autoidArray[$i]."'");}
if($countyArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$county."' WHERE autoid='".$autoidArray[$i]."'");}
if($phone1Array[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$phone1."' WHERE autoid='".$autoidArray[$i]."'");}
if($phone2Array[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$phone2."' WHERE autoid='".$autoidArray[$i]."'");}
if($emailArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$email."' WHERE autoid='".$autoidArray[$i]."'");}
if($idArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$id."' WHERE autoid='".$autoidArray[$i]."'");}
if($tsArray[$i]==""){mysqli_query($link,"UPDATE EmailListCopy SET title='".$ts."' WHERE autoid='".$autoidArray[$i]."'");}
//Now that it has been updated, delete the duplicate entry
mysqli_query($link, "DELETE FROM EmailListCopy WHERE autoid='".$autoid."'");
echo "<p>Duplicate to be updated DELETE FROM EmailListCopy WHERE autoid='".$autoid."'</p>";
}
}
else
{
//The duplicate autoid is lower then the one used to query either an entry we already but is still in the arrays, or something else.
//This is to be skipped.
echo "<p>Duplicate not to be updated</p>";
}
}
$result="Merged ".$duplicatesFound." rows.";
}
mysqli_stmt_free_result($stmt);
}
}
mysqli_stmt_close($duplicatestmt);
mysqli_stmt_close($stmt);
mysqli_close($link);
}
echo $result;
?>