Complex query help

Question

Hope someone can help with this.
I have a database structure :
table : photos
Photo_ID (PK)
Title
Orientation
etc
table : keywords
Keyword_ID (PK)
Keyword
Category
table : photokeywords
Photo_ID
Keyword_ID
I have a search page that uses checkboxes allowing users to
search on keywords, that returns any photos which match the
selected keywords.
In the search page the checkboxes are created using an array,
and are displayed as :
//Display the checkbox
echo "<td width=\"2%\">";
echo "<input type=\"checkbox\"
class=\"tickbox_".$row_type."\"";
if (in_array($keyword['Keyword_ID'],$photokeywords)) { echo
" checked"; }
echo " name=\"ckbox[".$keyword['Keyword_ID']."]\"
id=\"ckbox[".$keyword['Keyword_ID']."]\">";
echo "</td>\n";
Someone kindly helped me out some time ago to write a fairly
complex (for me!) query that counts the matches, so enabling the
results to be ordered by the number of matches, ie the most
relevant matches first.
The code for this is :
//db session
mysql_select_db($database_Photolibrary, $Photolibrary);
if (isset($_GET['ckbox'])){
// get profile keys
$ckbox = array_keys($_GET['ckbox']);
// sql string
$sql = 'SELECT *, Count(*) As rank FROM photos, photokeywords
WHERE photos.Photo_ID =
photokeywords.Photo_ID AND photokeywords.Keyword_ID IN(' .
implode(',', $ckbox).') GROUP BY
photos.Photo_ID ORDER BY rank DESC, Title';
$photos = mysql_query($sql) or die(mysql_error());
$row_photos = mysql_fetch_assoc($photos);
@$totalRows = mysql_num_rows($photos);
The page I have is using Tom Muck's pages list and horizontal
looper behaviours to display the results.
Everything works fine except the pages list, where there is
more than one page of results. I've emailed the ever helpful Tom
who has advised me that the query may need to be constructed in DW,
as the Pages List behaviour relies on DW's code to manage the
paging.
So I've gotten as far as the basic query code :
<?php
mysql_select_db($database_Photolibrary, $Photolibrary);
$query_photos = "SELECT *, Count(*) As rank FROM photos,
photokeywords WHERE photos.Photo_ID = photokeywords.Photo_ID AND
photokeywords.Keyword_ID IN(' . implode(',', $ckbox).') GROUP BY
photos.Photo_ID ORDER BY rank DESC, Title";
$photos = mysql_query($query_photos, $Photolibrary) or
die(mysql_error());
$row_photos = mysql_fetch_assoc($photos);
$totalRows_photos = mysql_num_rows($photos);
?>
But am unsure where I need to call the ckbox values,
previously :
if (isset($_GET['ckbox'])){
// get profile keys
$ckbox = array_keys($_GET['ckbox']);
in the DW construction.
I've been playing around with different things in the query's
variables, such as
Name : Keyword_ID
Default value : 1
Run time value : $_GET['ckbox']
but to no avail.
If anyone can help out with this it'd be much appreciated.
Cheers.

Answer 1

Something like this?
SQL> var P_DISCOUNT_RATE number
SQL> var P_BASE_YEAR number
SQL> var P_FUTURE_YEAR number
SQL> exec :P_DISCOUNT_RATE := 0.1; :P_BASE_YEAR := 2003; :P_FUTURE_YEAR := 2009;
PL/SQL-procedure is geslaagd.
SQL> select sum(npd)
  2    from ( select nvl
  3                  ( ( select sum(sal)
  4                        from emp
  5                       where to_number(to_char(hiredate,'yyyy')) + 25 = :P_FUTURE_YEAR - l
  6                    )
  7                  , 0
  8                  ) / power(1 + :P_DISCOUNT_RATE, l) npd
  9             from ( select level-1 l from dual connect by level <= 1 + :P_FUTURE_YEAR - :P_BASE_YEAR )
10         )
11  /
                              SUM(NPD)
22248,89010313503176012567447578717301
1 rij is geselecteerd.I counted 7 iterations for the values 2003 and 2009, so you might want to explain a little more.
Regards,
Rob.