多个WHERE和查询 - Mysql / PHP

Question

尝试将一个查询的结果放入另一个查询的WHERE语句中：

$query1 = "SELECT DISTINCT company_id FROM location WHERE state = 'XX'";
$result1 = mysql_query($query1) or die(mysql_error());
while($row1 = mysql_fetch_array($result1)) {
    //Collect WHERE STATEMENT HERE
}

我尝试了以下内容：

$q1 = "SELECT company FROM company WHERE id = '16', id = '7' ORDER BY company";
$q1 = "SELECT company FROM company WHERE id = '16' AND id = '7' ORDER BY company";
$q1 = "SELECT company FROM company WHERE id = '16' && id = '7' ORDER BY company";

与其他变体一起

如果使用不同的表名，谷歌搜索只提供了多个WHERE AND，但不一样。任何人有任何指针？

Answer 1

您也可以使用IN：

$x = array('16', '7');

$q1 = "SELECT company FROM company WHERE id IN(". implode(',', $x) .") ORDER BY company";

Answer 2

用于通用代码：

$ids = array (
[0] => 2
[1] => 4
[2] => 19
[3] => 16
);  

$ids = join(',',$ids);  
$sql = "SELECT * FROM company WHERE id IN ($ids)";

reffer：same example

Answer 3

使用OR

$q1 = "SELECT company FROM company WHERE (id = '16' OR id = '7') ORDER BY company";