'Lucky number' logic in SQL
Hi all
Nice day...
Note: This thread is just for fun and for learning the recursive techniques
Please ignore this if you are busy
-------------------------
https://en.Wikipedia.org/wiki/Happy_number
For example, 19 is happy, because the associated sequence is:
- 12 + 92 = 82
- 82 + 22 = 68
- 62 + 82 = 100
- 12 + 02 + 02 = 1.
I just wanted to know if anyone can re - write this below from pl/sql in regular SQL (using recursive with the clause may be)... Say then that pl/sql isn't so bad either... w.r.t. performance.
SET SERVEROUTPUT ON
DECLARE
l_res NUMBER;
l_var_new NUMBER;
BEGIN
FOR rec IN 0 .. 1000
LOOP
l_var_new := rec;
WHILE (TRUE)
LOOP
EXECUTE IMMEDIATE
'select '
|| RTRIM (REGEXP_REPLACE (l_var_new, '(.)', 'power(\1,2)+'), '+')
|| ' from dual'
INTO l_res;
IF ( (LENGTH (l_res) = 1 AND l_res <> 1) OR l_res = 1)
THEN
IF (l_res = 1)
THEN
--logmein.in ('NUMBER -> ' || rec); ---- logging method
DBMS_OUTPUT.put_line (rec); ---just for our comfort.. (not for logging ;-))
END IF;
EXIT;
END IF;
l_var_new := l_res;
END LOOP;
END LOOP;
END;
See you soon,.
Manik.
Very nice indeed.
I will add only minor simplification of the passage of the summons to a scalar subquery.
WITH data
AS ( SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 1000),
recurse (n, pwrsum)
AS (SELECT n,
( SELECT SUM (POWER (SUBSTR (n, LEVEL, 1), 2))
FROM DUAL
CONNECT BY LEVEL <= LENGTH (n))
AS pwrsum
FROM data
UNION ALL
SELECT n,
( SELECT SUM (POWER (SUBSTR (pwrsum, LEVEL, 1), 2))
FROM DUAL
CONNECT BY LEVEL <= LENGTH (pwrsum))
FROM recurse
WHERE pwrsum >= 10)
SELECT n
FROM recurse
WHERE pwrsum = 1
ORDER BY 1;
Tags: Database
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As I have created a thread already in this regard. You can refer to my previous thread in [previous Thread: http://forums.oracle.com/forums/thread.jspa?threadID=1027799 & tstart = 0]
I'll post my question again in this thread
Records from the tableSHIPMENT_ID SHIPMENT_PRICE SHIPMENT_ADDT_PRICE PRODUCT_ID PRODUCT_QTY VIRTUAL_COLUMN (Just for your Reference) 1000 6.95 2 11 4 1 1000 6.95 2 11 4 2 1000 3.95 1 13 2 3 1000 3.95 1 12 2 4 1001 12.95 2 11 4 5 1001 12.95 1 13 2 6 1001 12.95 2 11 4 7 1001 12.95 1 12 2 8 1002 20.95 1 12 2 9 1002 20.95 2 11 4 10 1002 20.95 2 11 4 11 1002 20.95 1 13 2 12
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*
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On your data, there is no difference because the same product as always the same shipment_price...
We will change a value in the sample data:Query 1
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SQL> with shipment_table as ( 2 select 1000 SHIPMENT_ID, 6.95 SHIPMENT_PRICE, 2 SHIPMENT_ADDT_PRICE, 3 11 PRODUCT_ID, 4 PRODUCT_QTY, 1 VIRTUAL_COLUMN from dual union 4 select 1000,6.95,2,11,4,2 from dual union 5 select 1000,100.95,2,11,4,3 from dual union 6 select 1000,6.95,2,11,4,4 from dual union 7 select 1001,12.95,2,11,4,5 from dual union 8 select 1001,12.95,2,11,4,6 from dual union 9 select 1001,12.95,2,11,4,7 from dual union 10 select 1001,12.95,2,11,4,8 from dual union 11 select 1002,20.95,1,12,2,9 from dual union 12 select 1002,20.95,1,12,2,10 from dual union 13 select 1002,20.95,1,12,2,11 from dual union 14 select 1002,20.95,1,12,2,12 from dual) 15 SELECT shipment_id, 16 shipment_price, 17 shipment_addt_price, 18 product_id, 19 product_qty, 20 CASE 21 WHEN ROW_NUMBER() OVER (PARTITION BY shipment_id 22 ORDER BY shipment_addt_price DESC) = 1 23 THEN 24 (max(shipment_price) over (PARTITION BY shipment_id)) 25 + (product_qty - 1) * shipment_addt_price 26 ELSE 27 product_qty * shipment_addt_price 28 END price 29 FROM shipment_table; SHIPMENT_ID SHIPMENT_PRICE SHIPMENT_ADDT_PRICE PRODUCT_ID PRODUCT_QTY PRICE ----------- -------------- ------------------- ---------- ----------- -------------- 1000 6,95 2 11 4 106.9500 1000 6,95 2 11 4 8.0000 1000 6,95 2 11 4 8.0000 1000 100,95 2 11 4 8.0000 1001 12,95 2 11 4 18.9500 1001 12,95 2 11 4 8.0000 1001 12,95 2 11 4 8.0000 1001 12,95 2 11 4 8.0000 1002 20,95 1 12 2 21.9500 1002 20,95 1 12 2 2.0000 1002 20,95 1 12 2 2.0000 1002 20,95 1 12 2 2.0000 12 rows selected.Max
http://oracleitalia.WordPress.comPublished by: Massimo Ruocchio, February 12, 2010 15:10
Examples added -
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Count (plcy_id) select 4)
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Create the function for ODD or EVEN (NUMBER) also
If number is odd, multiply by 5
If there is an even number, multiply it by 10;create function fn_get_no (n_in in number) return number is o_num number; begin if mod(n_in,2) = 0 then o_num := n_in*10; else o_num := n_in*5; end if; return o_num; end;select fn_get_no(5) odd, fn_get_no(4) even from dual; ODD EVEN 25 40Vivek L
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error ora-00036 maximum number of levels of sql recursive (50) exceeded
I have a trigger of the declaration on the LEVELS table, I want to update COMPONENTS field when another field is changed in TIERS, in order to avoid the calculations, I used to ch line shutter COMPONENTS to complete a package, but I get this error ora-00036 maximum number of recursive sql exceeded (50)
It's my trigger:
create or replace trigger DBTRGA_UPD_TIERS
after update on tiers
I INT ;
FOR I IN (PKG_TIERS. TAB. FIRST)... (PKG_TIERS. TAB. Last) LOOP
UPDATE to levels
PUT REFERENCE_EXTERNE = "YYYY"
WHERE LEVELS = PKG_TIERS. TAB (I). I_TIERS;
END LOOP;
end DBTRGA_UPD_TIERS;
This is ma for each trigger line:
create or replace trigger DBTRGA_UPD_TIERS_E
after Update FOR CODE_TYPE_TIERS on LEVELS
for each row
V_CPT INTEGER ;
IF : NEW. CODE_TYPE_TIERS IS NOT NULL THEN
IF PKG_TIERS. TAB. LAST IS NULL THEN
PKG_TIERS. TAB(1). I_TIERS: =: NEW. BLEACHERS;
PKG_TIERS. TAB(1). CODE_TYPE_TIERS: =: NEW. CODE_TYPE_TIERS;
ELSE
V_CPT: = PKG_TIERS. TAB. LAST + 1;
END IF;
END IF;
end DBTRGA_UPD_TIERS_E;
Clearly, you have past of recursion. After updating the table of LEVELS, then a statement trigger level (after update) as the fires that updates the table LEVELS... which will cause then itself to once again fire... which will cause himself to fire once again... which will cause itself to the light again... etc etc.
If it is a business logic that should be implemented, so you don't want to include it as a trigger, you want to just have a code in a package that updates the table once.
If it were me, I would scrap two triggers in this case. Have a trigger is fired for each row updated (in SQL) which has then cross to the PL/SQL package for details of this update line, means you to act so the context switching between SQL and PL/SQL for each update line, which will affect the performance of the updates.
Explain what you're actually trying to do (business logic), with a few examples and data tables and we might be able to propose a better approach, which is not abusing triggers in this way.
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How to check for number of RPC in SQL Server 2000?
Please let me know how check the number RPC in sql server 2000.
Hello
You should post this question in the TechNet forums.
Forums TechNet - Windows 7 IT Pro
http://social.technet.Microsoft.com/forums/en/category/w7itpro
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Display SCSI logic unit number name
Hello
I'm working on a script that will rename the name of unit number logic SCSI (the name of the LUN storage in vCenter under/device). I've seen scripts that will do the name change, however I need to rename based on the ID of LUNS (Lun number).
I have scripted one pace ID LUN and paths of our (NetApp) storage system to a csv file and that you want to rename in the CSV-based VMware.
Any help would be greatly appreciated.
Kind regards
Simon
Try something like that.
Note that the script does not handle duplicate LunIDs!
# Store the LUN info in a hash table
# Key is the Monday
$lunTab = @ {}
Import-Csv-path testLuns.csv - UseCulture | %{
$lunTab.Add ($_.) Monday, $_. Path)
}
# Look all ESXi
{foreach ($esx in Get-VMHost)
$storSys is get-view-Id $esx. ExtensionData.ConfigManager.StorageSystem
# Look all LUNS and change DisplayName if Monday is in the list
ScsiLun get - LunType - VmHost disk $esx | %{
$lunID = $_. RuntimeName.Split('L') [1]
{if ($lunTab.ContainsKey ($lunID))}
$newName = $lunTab [$lunID]
$uuid = $_. ExtensionData.Uuid
$storSys.UpdateScsiLunDisplayName ($uuid, $newName)
}
}
}
-
ESXi 5.5 - Direct access to the local logical unit number
I have a 5.5 stand-alone ESXi server.
It has 2 local SAS controllers
Controller 1 (HP Smart Array P410): data bank single RAID 10 with two VM's local logic unit number
Controller 2 (HP Smart Array P812): only RAID 6 LUNS nothing on it yet...
My question is that I need one of the virtual machine to access that LUN. Is it possible to give direct access to the VM to the controller and/or the unit number logic rather than create a vmdk and massive data store?
If it is I know Flash would not work on these data, but that really doesn't matter in this case.
Thank you
Kenny
Hi Kenny, and welcome to the communities,
There is an article dealing with your situation KB: http://kb.vmware.com/kb/1017530
Concerning
Tim
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When you add a logical unit number to a an ASM diskgroup, made any start to process internally
When you add a number logic unit to an ASM diskgroup, done any what beginning of process internally?Version: 10.2, 11.2 on Unix/Linux platformsHello;
I think that oracle ASM can start a process to restore balance after the addition of a Lun.
http://docs.Oracle.com/CD/E11882_01/server.112/e18951/asmdiskgrps.htm
Best regards
mseberg
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