insert or update / and ignore

Hello.

let's say i want to add a row to a table called "todaypics" with this 3 columns:
| picnum | imagename | todayhits |

and i do this:

PHP Code:

---

mysql_query("INSERT INTO todaypics (picnum, imagename, todayhits) VALUES('72', 'somepicturename.jpg', '35') ") 
or die(mysql_error()); 


---

the data is inserted
| 72 | somepicturename.jpg | 35 |
witn no problem.

but if the row was already on the
tablewith this data:...
| 72 | somepicturename.jpg | 34 |

...how sohuld be the query to avoid the duplicate error and update the column "todayhits" value to 35??

other situation i have:

on the other table named "pics", i have hundreds of rows.
the columns are:
| picnum | imagename | hits |

if i want to display the 1st 50 images sort by hits i do this:

PHP Code:

---



$result = mysql_query("SELECT * FROM pics ORDER BY hits desc LIMIT 50") 
or die(mysql_error());  
echo "<table border='1'>";
echo "<tr> <th> PicNum </th> <th> Picture </th> <th> Views </th></tr>";
// keeps getting the next row until there are no more to get
while($row = mysql_fetch_array( $result )) {
    // Print out the contents of each row into a table
    echo "<tr><td>";
    echo $row['pid'];
    echo "</td><td>";
    echo "<a href=\"/image-path/".$row['imagename']."\" target=\"_blank\"><img src=\"/thumbnail-path/".$row['imagename']."\" /><a/>";
    echo "</td><td>"; 
    echo $row['hits'];

    echo "</td></tr>";
} 
echo "</table>"; 


---

if 50 images are to be displayed, but only 25 has some hits, the rest of the images are ordered by picnum..

is there a way to ignore the rows when the "hits" value is zero?
:confused:

For your first question, see the ON DUPLICATE KEY syntax for INSERT; or a simpler but less portable solution is the REPLACE INTO query syntax.