Php多mySQL查询

是否可以在一个查询中从多个表中检索数据数组？例如，我从表1中获取一个数组，但我也想从其他几个表中检索数据：

<?php


   $con = mysql_connect($hostname,$username, $password);
   if (!$con)
     {
     die('Could not connect: ' . mysql_error());
   }
   mysql_select_db($dbname, $con);

   $today = date('Y-m-d H:i:s', time());
   $today1DayAgo = date('Y-m-d H:i:s', strtotime("$today -1 day"));
   $query = "SELECT * FROM table1 WHERE omtr_date BETWEEN '$today1DayAgo' AND '$today'";

   $result = mysql_query($query);

   while($row = mysql_fetch_array($result)){
       echo $row["omtr_page_view"]);
   }

   mysql_close($con);

  ?>

---

您可以使用连接来执行此操作：

例如

（未经测试）

也许值得一读
 如果您的表有一些共同点，比如table1的1列是table2的主键，或者任何类型的关系（比如同一列），则可以使用联接

否则，您也可以使用UNION，例如

SELECT omtr_date1.a AS a1, omtr_date1.b AS b1 FROM table1 WHERE omtr_date1 BETWEEN '$today1DayAgo' AND '$today'
UNION
SELECT omtr_date2.c AS a1, omtr_date2.d AS b1 FROM table1 WHERE omtr_date2 BETWEEN '$today1DayAgo' AND '$today'

但这两个select语句必须生成相同列数和相同列名的列

这对您有好处。
使用Mysql连接

以下是一个例子：

<?php
// Make a MySQL Connection

// Construct our join query
$query  = "SELECT family.Position, food.Meal ";
$query .= "FROM family INNER JOIN food ";
$query .= "WHERE family.Position = food.Position";

//Execute query  
$result = mysql_query($query) or die(mysql_error());

// Print out the contents of each row into a table 
while($row = mysql_fetch_array($result)){
    echo $row['Position']. " - ". $row['Meal'];
    echo "<br />";
}
?>



此处列出了更多mysql连接示例：
请注意，
mysql\u xx（）
函数已被弃用，不建议使用。您应该尽快切换到
mysqli_xx（）
函数或PDO库。另见
<?php
// Make a MySQL Connection

// Construct our join query
$query  = "SELECT family.Position, food.Meal ";
$query .= "FROM family INNER JOIN food ";
$query .= "WHERE family.Position = food.Position";

//Execute query  
$result = mysql_query($query) or die(mysql_error());

// Print out the contents of each row into a table 
while($row = mysql_fetch_array($result)){
    echo $row['Position']. " - ". $row['Meal'];
    echo "<br />";
}
?>