php MySQL得到字符串之间的区别

Question

我的脚本可以满足要求，但是由于这个原因会触发数千个查询，因此需要50-65秒。 我正在寻找替代，更优雅，更快捷的解决方案。

SELECT GROUP_CONCAT(DISTINCT BatchNo SEPARATOR ', ') AS picklists, web_company_name
FROM PickBatch 
LEFT JOIN customer_master ON customer_master.VC_CUSTOMER_CODE = PickBatch.Customer
GROUP BY Customer

这将返回列选择列表，例如4334、3443、3341、4543

之后，我必须将其与另一列进行比较

while( $row=mysql_fetch_array($res) )
{   
     $picklists = explode(', ', $row['picklists']);
     $pickString = '';
     foreach($picklists as $batch)
     {
         //invoiced
         $sql2 = "SELECT invoice_no FROM invoice_web_order WHERE FIND_IN_SET('$batch', frombatch) LIMIT 1";
         $res2 = mysql_query($sql2) or die(mysql_error());
         if ( mysql_num_rows($res2) > 0 )
         {
             continue;
         }   
        $pickString .= "$batch, ";
    }
    echo $pickString;
}

因此，例如，将4334、3443、3341、4543与例如“ frombatch”中的3892、4890、3341、2389进行比较将排除3343。

还有其他方法可以做到吗？ 这样只会返回4334、3443、4543？

Answer 1

您能提供表格定义吗？

SELECT 
    DISTINCT BatchNo as BN, 
    GROUP_CONCAT(DISTINCT BatchNo SEPARATOR ', ') AS picklists, 
    web_company_name
FROM PickBatch
LEFT JOIN customer_master ON customer_master.VC_CUSTOMER_CODE = PickBatch.Customer
WHERE PickBatch.BN <>      (SELECT frombatch 
                            FROM invoice_web_order 
                            WHERE FIND_IN_SET(PickBatch.BN, frombatch)
                            LIMIT 1)
GROUP BY Customer

Answer 2

似乎您只是想知道PickBatch中存在哪些批号，而invoice_web_order表中任何行的frombatch列中都不存在该批号。

Table: PickBatch
BatchNo
4334
3443
3341
5453

Table: invoice_web_order
frombatch
3982, 4890, 3341, 2389
####, ####, ####
####, ####, ####, ####

SELECT DISTINCT batchno FROM PickBatch LEFT JOIN invoice_web_order ON FIND_IN_SET(batchno, frombatch) WHERE invoice_web_order.frombatch IS NULL

您还按客户进行了分组，但不知道为什么。 如果您有解释，我将在适当的情况下帮助您解决该问题。