php – MYSQL – INSERT错误,字段列表中的未知列

require_once("connect.PHP");

$query = MysqL_query("SELECT * FROM accounts ORDER BY id DESC LIMIT 1");
$row = MysqL_fetch_assoc($query);

$balanceold = $row['balance'];
$difference = $_POST['predec'].".".$_POST['dec'];

$category = $_POST['category'];
$notes = $_POST['notes'];

if(isset($_POST['in'])){
$balancenew = $balanceold + $difference;
$query = MysqL_query("INSERT INTO accounts(currentbalance,balancein,category,notes) VALUES (".$balancenew.",".$difference.",".$category.",".$notes.")");  
if($query){
header("Location: budget.PHP"); 
}
else{
die(MysqL_error());
}
}

给出错误：
“字段列表”中的未知列“发薪日”

这是我的表单代码：

<form action=process.PHP method=post>

&pound;
<input type=text name=predec size=7>
. 
<input type=text name=dec size=4 value=00>
<br />
<select name=category>
<option value=payday>Payday</option>
</select>
<input type=text name=notes size=20>
<input type=submit name=in value=Deposit>
<input type=submit name=out value=Withdraw>
</form>

数据库表“accounts”包含以下字段：

id,int primary A_I

balancein,十进制10,2

平衡,2

当前余额,2

category,varchar 50

notes,varchar 255

日期,时间戳

…以该顺序