mysql - Checking database for duplicate values, no error -


hi hoping @ section of code see if can find mistakes can't seem figure out, section of code is;

//check if "date" textbox has value if ((isset($_post['date'])) && (isset($_post['save'])))     {     //check if there entry date     $query = "select date `".$username."weight` date= " . $_post['date'];     $existingdate = mysql_query($query) or trigger_error(mysql_error().$query);     $results = mysql_num_rows($existingdate);     if($results > 0)      {       $exists = "there entry date. add entry please select date 'weight history' section , click 'edit'";      }      else       {      $date = $date;      }    }

the situation is; - user enters date, weight , have option of entering notes. - when log in user , enter information, enters database fine. - but, when user goes enter entry, want first check havent made entry day. therefore, above code checks if table contains entry specified date.

i not receiving errors, form keeps entering values, regardless of whether there entry date.

i appreciate thanks.


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