为什么我的查询适用于3列但是4或更多失败？

Question

此查询有效:

$con = mysql_connect("localhost","root","pw");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("db", $con);

$sql="INSERT INTO l1_clubmsg (msg, subject, status)
VALUES
(1,1,1)";

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "1 record added";

mysql_close($con);

但是当我改变时:

$sql="INSERT INTO l1_clubmsg (msg, subject, status)
VALUES
(1,1,1)";

至:

$sql="INSERT INTO l1_clubmsg (msg, subject, status, to)
VALUES
(1,1,1,1)";

我收到此错误:

Error: You have an error in your SQL syntax; check the manual that corresponds to your 

MySQL server version for the right syntax to use near 'to) VALUES (1,1,1,1)' at line 1

'to'列确实存在于l1_clubmsg中

任何想法为什么会出错？谢谢

Answer 1

TO 是mysql中的保留字,因此如果要将其用作列名,则需要将其转义为;

INSERT INTO l1_clubmsg (msg, subject, status, `to`) VALUES (1,1,1,1)

逃避所有列和表名称通常是个好主意,因为较新版本的数据库可能有新的保留字,但在这种情况下只需要一个.