PHP Union-仅当table name=table1时显示数据

我有一段PHP代码，它使用一个并集从两个表中进行选择

在while循环中有另一个SQL查询$sql9，它查找时间差，但是如果结果/行来自名为ticket\u updates的表，而不是ticket\u changes表，我只需要它来显示该数据

---

如何实现这一点？

可能有更好的方法，但我认为您可以更改查询并检查数据来自哪个表，您将在结果中获得一个新列“rowTable”，然后在代码中使用它：

$sql3="
SELECT 
'ticket_updates' as rowTable,
sequence, 
ticket_seq, 
notes as displaydata, 
datetime as timestamp, 
updatedby, 
CONCAT('<strong>Time Start: </strong>',timestart,' - <strong>Time End: </strong>',timeend) as timestartend
from ticket_updates where ticket_seq = '".$_GET["seq"]."'

UNION

SELECT 
'ticket_changes' as rowTable,
sequence, 
ticket_seq, 
description as displaydata, 
datetime as timestamp,  
changed_by as updatedby, 
blankfield
from ticket_changes where ticket_seq = '".$_GET["seq"]."' 

ORDER by timestamp ASC ";

    $rs3=mysql_query($sql3,$conn) or die(mysql_error());
while($result3=mysql_fetch_array($rs3))
{
    $timestartend2 = ($result3["timestartend"] > '') ? '<br><br>'.$result3["timestartend"] : '';
if ($result3['rowTable'] == 'ticket_updates') {
    $sql9="SELECT *,  TIMEDIFF( timeend, timestart ) AS support_time_used FROM ticket_updates WHERE sequence = '".$result3["sequence"]."' ";
    $rs9=mysql_query($sql9,$conn) or die (mysql_error());
    $result9=mysql_fetch_array($rs9);
    $update_times = 'Time Took: '.$result9["support_time_used"];
} else {
    $update_times = 'N/A';
}
    echo '<tr>
                <td colspan="2" bgcolor="#666666" align="left"><font color="#FFFFFF"><strong>'.$result3["updatedby"].'</strong></font></td>
                <td bgcolor="#666666" align="right"><font color="#FFFFFF"><strong>'.$result3["timestamp"].'</strong></font></td>
            </tr>
            <tr>
                <td colspan="3">'.nl2br(stripslashes($result3["displaydata"])).''.$timestartend2.'<br><br>'.$update_times.'</td>
            </tr>
            <tr>
                <td colspan="3"></td>
            </tr>';
}

---

可能有更好的方法，但我认为您可以更改查询并检查数据来自哪个表，您将在结果中获得一个新列“rowTable”，然后在代码中使用它：

$sql3="
SELECT 
'ticket_updates' as rowTable,
sequence, 
ticket_seq, 
notes as displaydata, 
datetime as timestamp, 
updatedby, 
CONCAT('<strong>Time Start: </strong>',timestart,' - <strong>Time End: </strong>',timeend) as timestartend
from ticket_updates where ticket_seq = '".$_GET["seq"]."'

UNION

SELECT 
'ticket_changes' as rowTable,
sequence, 
ticket_seq, 
description as displaydata, 
datetime as timestamp,  
changed_by as updatedby, 
blankfield
from ticket_changes where ticket_seq = '".$_GET["seq"]."' 

ORDER by timestamp ASC ";

    $rs3=mysql_query($sql3,$conn) or die(mysql_error());
while($result3=mysql_fetch_array($rs3))
{
    $timestartend2 = ($result3["timestartend"] > '') ? '<br><br>'.$result3["timestartend"] : '';
if ($result3['rowTable'] == 'ticket_updates') {
    $sql9="SELECT *,  TIMEDIFF( timeend, timestart ) AS support_time_used FROM ticket_updates WHERE sequence = '".$result3["sequence"]."' ";
    $rs9=mysql_query($sql9,$conn) or die (mysql_error());
    $result9=mysql_fetch_array($rs9);
    $update_times = 'Time Took: '.$result9["support_time_used"];
} else {
    $update_times = 'N/A';
}
    echo '<tr>
                <td colspan="2" bgcolor="#666666" align="left"><font color="#FFFFFF"><strong>'.$result3["updatedby"].'</strong></font></td>
                <td bgcolor="#666666" align="right"><font color="#FFFFFF"><strong>'.$result3["timestamp"].'</strong></font></td>
            </tr>
            <tr>
                <td colspan="3">'.nl2br(stripslashes($result3["displaydata"])).''.$timestartend2.'<br><br>'.$update_times.'</td>
            </tr>
            <tr>
                <td colspan="3"></td>
            </tr>';
}

---

如果您必须显示票证更新中的数据，如果您理解我的意思，为什么联盟为什么不离开加入如果您必须显示票证更新中的数据，如果您理解我的意思，为什么联盟为什么不离开加入