Sub-Select Count query breaking TOAD

Oracle 10.2.0.4.0
Running TOAD 9.1
I am running some SQL on our eBusiness Suite:
SELECT pha.segment1
     , pha.type_lookup_code
     , (SELECT COUNT(DISTINCT pha2.po_header_id)
          FROM po.po_headers_all pha2
             , po.po_lines_all pla
         WHERE pha2.po_header_id = pla.po_header_id
           AND pla.contract_id = pha.po_header_id) po_count
     , (SELECT MAX(pha2.creation_date)
          FROM po.po_headers_all pha2
             , po.po_lines_all pla
         WHERE pha2.po_header_id = pla.po_header_id
           AND pla.contract_id = pha.po_header_id) latest_cpa_po
FROM po.po_headers_all pha
     , po.po_vendors pv
     , po.po_vendor_sites_all pvsa
WHERE pha.vendor_id = pv.vendor_id
   AND pha.vendor_site_id = pvsa.vendor_site_id
--   AND pv.VENDOR_NAME LIKE 'H%'
   AND pha.vendor_id = 98
   AND pha.type_lookup_code = 'CONTRACT'
   AND pha.org_id IN(7041, 7042);The above query runs quicky (approx. 1 second). If I take out the AND pha.vendor_id = 98 then the query takes a few minutes to run.
When I try to export it, or scroll down to view > 500 rows, TOAD crashes.
I know this isn't a TOAD forum, but I think that this is probably an issue with my no doubt rubbish SQL.
If I take out this sub-select, then the problem doesn't happen:
     , (SELECT COUNT(DISTINCT pha2.po_header_id)
          FROM po.po_headers_all pha2
             , po.po_lines_all pla
         WHERE pha2.po_header_id = pla.po_header_id
           AND pla.contract_id = pha.po_header_id) po_countHowever, I can't work out a better way of getting the data I need.
The sub-select counts POs which have been raised where the contractID on the PO line is the same as the PO Header ID from the main query.
Any advice please, on what I could do to sort this out would be much appreciated.
Thanks!

Hi,
It looks like you can replace both scalar sub-queries with a join, like this:
WITH     header_lines_summary     AS
     SELECT    pla.contract_id
          ,       COUNT (DISTINCT pha2.po_header_id)     AS po_count
          ,       MAX (pha2.creation_date)          AS latest_cpa_po
          FROM        po.po_headers_all pha2
             ,        po.po_lines_all   pla
         WHERE        pha2.po_header_id = pla.po_header_id
      GROUP BY       pla.contract_id
)                                        -- Everything up to this line is new
SELECT pha.segment1
     , pha.type_lookup_code
     , hls.po_count                              -- Changed
     , hls.latest_cpa_po                         -- Changed
FROM po.po_headers_all     pha
     , po.po_vendors           pv
     , po.po_vendor_sites_all      pvsa
     , header_lines_summary     hls                    -- New
WHERE pha.vendor_id          = pv.vendor_id
   AND pha.vendor_site_id     = pvsa.vendor_site_id
   AND pha.po_header_id          = hls.contract_id (+)          -- New
--   AND pv.VENDOR_NAME      LIKE 'H%'
   AND pha.vendor_id           = 98
   AND pha.type_lookup_code      = 'CONTRACT'
   AND pha.org_id           IN (7041, 7042);Aside from the sub-query (which is entirely new), the query above is just what you posted, with 2 lines changed and 2 lines added, as marked.
This should be more efficient, but I don't know for certain that it will solve the Toad problem.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables, and also post the results you want from that data.
It never hurts to say what version of Oracle you're using.

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There is no such thing as 'in general'.
It all depends on 'what' data you want to get if you are querying a table and exactly how the function actually works if you are calling a function.
A query that 'gets' one column very fast might take days to 'get' ALL columns.
A function that does different queries based on the parameters might return data quickly for one parameter value and be very slow for a different parameter value.
Start over and tell us what BUSINESS PROBLEM you are trying to solve.

Attn: PDO Experts (COUNT query)

This is an example of the type of a PHP/MySQL query I use to display dynamic web pages. This particular query is associated with a website/section that displays URL's like MySite/People/Crazy_Horse, where Crazy_Horse = both $MyURL and a value in the field URL, table people...
$res = mysql_query("SELECT COUNT(URL)
FROM people
WHERE URL = '$MyURL' AND Site = 'PX'
OR '$MyURL' = CONCAT('Washington/', URL) AND Site = 'SM'");
if (!$res) {
    die('Invalid query: ' . mysql_error());
$result = mysql_result($res, 0);
// PART 2 - Interpret the results...
switch ($result)
case 1:
// include related files
break;
case 0:
// include 404 NOT FOUND error message
break;
default:
// multiple entries; deal with as needed
break;
Now I'm trying to learn PDO, and I assumed the simplest queries would be the simplest to convert to PDO. To my surprise, many online references say PDO can't perform COUNT queries! As I understand it, all the PDO queries that do this sort of thing are workarounds. After consulting several tutorials and forums and trying several scripts, I still don't have a working model. This is what I'm trying at the moment:
I start out with my PDO database connection (replacing "USERNAME" and "PASSWORD" with my username and password, of course...
try {
    $db = new PDO('mysql:host=localhost;dbname=db_new;charset=utf8', 'USERNAME', 'PASSWORD');
} catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
The above code is on a separate file that's included in every page on my website.
I then have this code on a downstream file...
$sql= "SELECT URL FROM people
WHERE URL = '$MyURL'";
$stmt = $pdo->prepare($sql);
$stmt->execute();
$total = $stmt->rowCount();
But it doesn't work, and there's no error message to indicate what the problem is. (However, if I modify my username or password in the connection script, I do get an error message referring to my database connection.) Once I do get it to work, I assume I can finish the job by simply replacing $result with $total...
switch ($total)
case 1:
// include related files
break;
case 0:
// include 404 NOT FOUND error message
break;
default:
// multiple entries; deal with as needed
break;
Can anyone tell me what I'm doing wrong, and how I can fix it?
Thanks.

How does this post relate to Web Design?   Any ideas?

Sub-Select Count query breaking TOAD

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