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请帮我分析一下这个php语句!

请帮我分析一下这个php语句!

$sql.="='".$PlayerName."' and Date between '".$ksrq."' and '".$jsrq."'";
程序报错:
You have an error in your SQL syntax near ') as total from vmatlog where ='ladder5s.mpg' and Date between '2003-07-10' and ' at line 1      

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$sql.="='".$PlayerName."' and Date between '".$ksrq."' and '".$jsrq."'";

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$sql = "='" . $PlayerName . "' and Date between '" . $ksrq . "' and '" . $jsrq . "'";

这样清楚多了      

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