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MYSQL话语疑惑

WBOY
WBOYOriginal
2016-06-13 12:44:16828browse

MYSQL语句疑惑
 $sql="select * from news where id = '".$_GET['id']."'";
 $query=mysql_query($sql);
 $rs=mysql_fetch_array($query);


上面那句查询语句为什么这样写会出错$sql="select * from news where id = $_GET['id']";
求解答,新手关于单引号和双引号的区别和为什么要上面那样写,不明白,谢谢!

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