";
if($xk<>""){$sql="SELECT * FROM `jysj` where tksj='$tksj' and xk='$xk' ";}
if($sknj<>""){$sql="SELECT * FROM `jysj` where tksj='$tksj' and nj='$sknj' ";}
if($sknj<>"" and $xk<>""){$sql="SELECT * FROM `jysj` where tksj='$tksj' and nj='$sknj' and xk='$xk' ";}
$rs=mysqli_query($db,$sql);
$zong=mysqli_num_rows($rs);
//echo $sq2." ";
?>