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我有这些代码：PHP mysql如何连接两个表
<?php
$records = mysql_connect('localhost', 'root', '') or die(mysql_error());
mysql_select_db('records', $records);
if(isset($_GET['src']))
{
$sql = "SELECT * FROM students where studentnumber like '%{$_GET['src']}%'";
$cnt = mysql_num_rows(mysql_query($sql));
if ($cnt == 0)
{
echo "<script>alert('No Record Found');</script>";
}
$result = mysql_query($sql, $records);
echo "<table border='0' class='table table-striped table-bordered table-hover'>";
echo "<tr class='info'><td width='10%'>Name</td><td width='11%'>Course Yr-Sec</td><td width='10%'>Student Number</td><td width='10%'>Violation</td><td width='10%'>Punishment</td><td width='9%'>Violation Date</td><td width='7%'>Punishment Date</td><td width='5%'>CS Length</td><td width='4%'>CS Done</td><td width='4%'>CS Left</td><td width='17%'><center>Action</center></td></tr></tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>";
echo $row['Lastname'];
echo ", ";
echo $row['Firstname'];
echo " ";
echo $row['Middleinitial'];
echo "</td>";
echo "<td>";
echo $row['Course'];
echo " ";
echo $row['Year'];
echo "-";
echo $row['Section'];
echo "</td>";
echo "<td>";
echo $row['Studentnumber'];
echo "</td>";
echo "<td>";
echo $row['Violation'];
echo "</td>";
echo "<td>";
echo $row['Punishment'];
echo "</td>";
echo "<td>";
echo $row['Violationdate'];
echo "</td>";
echo "<td>";
echo $row['Punishmentstartdate'];
echo "</td>";
echo "<td>";
echo $row['CSlength'];
echo "</td>";
echo "<td>";
echo $row['CSDone'];
echo "</td>";
echo "<td>";
echo $row['CSLeft'];
echo "</td>";
echo "<td>";
echo "<a href='edit.php?no={$row['ID']}'><input type='button' name='edit' value='Edit' class='btn btn-success'></a>";
echo " <a href='delete.php?no={$row['ID']}'><input type='button' name='delete' value='Delete' class='btn btn-danger'></a>";
echo " <input type='button' name='view' value='View' class='btn btn-info'>";echo "</td>";
echo "</tr>";
}
echo "</table>";
}
else
{
$sql = 'SELECT * FROM students';
$result = mysql_query($sql, $records);
echo "<table border='0' class='table table-striped table-bordered table-hover'>";
echo "<tr class='info'><td width='10%'>Name</td><td width='11%'>Course Yr-Sec</td><td width='10%'>Student Number</td><td width='10%'>Violation</td><td width='10%'>Punishment</td><td width='9%'>Violation Date</td><td width='7%'>Punishment Date</td><td width='5%'>CS Length</td><td width='4%'>CS Done</td><td width='4%'>CS Left</td><td width='17%'><center>Action</center></td></tr></tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>";
echo $row['Lastname'];
echo ", ";
echo $row['Firstname'];
echo " ";
echo $row['Middleinitial'];
echo "</td>";
echo "<td>";
echo $row['Course'];
echo " ";
echo $row['Year'];
echo "-";
echo $row['Section'];
echo "</td>";
echo "<td>";
echo $row['Studentnumber'];
echo "</td>";
echo "<td>";
echo $row['Violation'];
echo "</td>";
echo "<td>";
echo $row['Punishment'];
echo "</td>";
echo "<td>";
echo $row['Violationdate'];
echo "</td>";
echo "<td>";
echo $row['Punishmentstartdate'];
echo "</td>";
echo "<td>";
echo $row['CSlength'];
echo "</td>";
echo "<td>";
echo $row['CSDone'];
echo "</td>";
echo "<td>";
echo $row['CSLeft'];
echo "</td>";
echo "<td>";
echo "<a href='edit.php?no={$row['ID']}'><input type='button' name='edit' value='Edit' class='btn btn-success'></a>";
echo " <a href='delete.php?no={$row['ID']}'><input type='button' name='delete' value='Delete' class='btn btn-danger'></a>";
echo " <input type='button' name='view' value='View' class='btn btn-info'>";
echo "</td>";
echo "</tr>";
}
echo "</table>";
}
?>
它包含了搜索，编辑，删除和查看功能......现在我的问题是...我想加入的两个表数据库由列studentnumber ... 我的表学生包含列姓，名，中初级，课程，年，部分，学号，违规，处罚，Violationdate，惩罚开始日期，CSlength，ID，CSDone，CSLeft ...现在我的另一个名为students2的表包含以下行ID，学号，违规，处罚，Violationdate，惩罚开始日期，CSlength，CSDone，CSLeft ...我想要显示我的两个表中的信息...例如，我想要查看所有记录从数据库的ds从20101000的学生数量...我有内部加入表吗？ 我只是一个新手在PHP ... 在此先感谢... :)
请在你的问题和期望列中添加表结构。 –
可能重复[MySQL连接where子句]（http://stackoverflow.com/questions/1219909/mysql-join-with-where-clause） –
Lastname（varchar），Firstname（varchar），Middleinitial（varchar）， （日期），CSlength（int），ID（int，primary）键，自动增量），CSDone（int），CSLeft（int）... 我想获取所有列在这两个表中...鉴于另一个表没有所有的信息，因为第一个表有它.. 。@AbhikChakraborty ... – Xthiahn29