Problem with count.

I'm having a bad couple of days.  This code will return the correct count on some addresses and not on others.  The count should be either one or zero.  I've pasted the query into MySql and it does return the correct record.

$SqlString1 = "SELECT * FROM bld1 WHERE SEQ = '".$SurveySeq.$work."'";
      $Bld1 = mysql_query($SqlString1);
      $ROW1=mysql_fetch_array($Bld1, MYSQL_BOTH);

      // ****************************************************
      // * Find out number of rows.                         *
      // ****************************************************
      $Bld1_Count = mysql_num_rows($Bld1);
      echo "String1 = ".$SqlString1."<br>";
      echo "Count = ".$Bld1_Count."<br>";

If I use "Select count(seq) in the query, how do it get the number of rows?
Glenn