Check if MySQL query result is Empty PHP

Check if PHP MySQL query result  is Empty. Sometimes, we need to check whether the data is existing or not before inserting a new one.  Basically, the operations needs to query and get the results count. There is no other options now. So just use the following code to get the results.

<?php
	$sql = mysql_query("SELECT * FROM table");
	if(mysql_num_rows($sql) > 0){
		$final_query = "UPDATE Kv_table_name SET user_id=".$user_id." user_name=".$user_name." WHERE id=".$id ; 
	}
	else{
		$final_query = "INSERT INTO Kv_table_name (user_id, user_name) VALUES("234" ,"Kvvaradha"); 
	}
	
	$result = mysql_query($final_query); 
?>

Here the above code tests, whether the result exist or not, than it will insert a new value or update existing one with new values,