How to avoid the below nested select statement

Please any one help me how this select statemet is working and      how to avoid the nesetd select statement .
if we avoid below nested , does it improve performace ?
select field1 field2
           into table w_feeds
           from ZTable as t
           where field2 in r_feedf1
           and POSITION_POSTDT =
           ( SELECT MAX( position_postdt ) FROM zTable
                  where position_postdt le r_pdate-high
                  and   field1 = t~field1 ).
Thanks in Advace.

Hi,
Instead of nested query go for two separate queries. I see you are querying on the same table...so better go by this approach
select field1 field2 POSITION_POSTDT
into table w_feeds
from ZTable
where field2 in r_feedf1.
Remove the where condition on POSITION_POSTDT
Sort the table w_feeds by POSITION_POSTDT Descending; So you will get data pertaining to Max Position_Postdt.
Finally delete the other entries which are not Max.
This will enhance the performance over the nested query.
Regards
Shiva
Edited by: Shiva Kumar Tirumalasetty on Apr 27, 2010 7:00 PM
Edited by: Shiva Kumar Tirumalasetty on Apr 27, 2010 7:00 PM

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Keep your post to under 1200 characters, else you loose the formatting. (you can do two posts if need be).
Re. parameters. First, make sure yo have SP 1 for CR 10.5:
https://smpdl.sap-ag.de/~sapidp/012002523100009351512008E/crbasic2008sp1.exe
Next, see the following:
[Crystal Reports for Visual Studio 2005 Walkthroughs|https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/2081b4d9-6864-2b10-f49d-918baefc7a23]
CR Dev help file:
http://msdn2.microsoft.com/en-us/library/bb126227.aspx
Samples:
https://wiki.sdn.sap.com/wiki/display/BOBJ/CrystalReportsfor.NETSDK+Samples
Ludek
Follow us on Twitter http://twitter.com/SAPCRNetSup

Is it possible to nest SELECT statements?

Greetings community,
Another newbie’s question it is. Looking tutorials and some posts here I’ve been advised not to pull entire table through the local network, and torture client machines’ processors and memory. It’s been said that better solution is to
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So, imagine this: you want to make a part of your app that would allow your user to view list of orders. So you put one data grid view on the form, pull last 20 headers from the table into it and leave to user to choose one to be opened
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Hi Erland,
Sorry for the very late reply, but I said that I would start another thread when I find more free time to dedicate it to this, so I didn’t really expected you to reply anymore. I didn’t really check here for more than a week, and I glanced
at mail accidentally.
As for the negative result I got, its measurement unit is microsecond, so it doesn’t go out of margins you had experienced.
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areas in it.
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Hi
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<pre>
SELECT
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Edited by: Jacie Johns on Apr 23, 2009 11:26 PM

HI John,
Try to avoid INTO CORRESPONDING FIELDS in SELECT statement.
As you are not using PSPNR and POSNR fields in the first SELECT statement. If you remove these fields, in structure, INTO CORRESPONDING FIELDS can be avoided. Create a separate structure with the fields that are required for T_OUTPUT table (i.e. create another structure with only first 4 fields, as T_OUTPUT1.
And as mentioned in your code,
WHERE objnr = st_output-objnr
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in select statement, ST_OUTPUT-PSPNR value is not fetched in the previous select statements.
Create Another structure with fields OBJNR, PSPNR, POSNR for table T_OUTPUT2 to store the data from tables, PRPS and IMZO.
Use JOINS and FOR ALL ENTRIES to fetch the desired data.
The sample code is as follows:
===
TYPES: BEGIN OF ty_output1,
objnr       TYPE coss-objnr,
gjahr       TYPE coss-gjahr,
kstar       type coss-kstar,
projn       type afvc-projn,
END OF ty_output1,
BEGIN OF ty_output2,
objnr       TYPE coss-objnr,
pspnr       type prps-pspnr,
posnr       type imzo-posnr,
END OF ty_output2,
BEGIN OF ty_output3,
objnr       TYPE coss-objnr,
gjahr       TYPE coss-gjahr,
kstar       type coss-kstar,
projn       type afvc-projn,
pspnr       type prps-pspnr,
posnr       type imzo-posnr,
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data: year TYPE coss-gjahr value '2007'.
DATA:
       wa_output1 TYPE ty_output1,
       wa_output2 TYPE ty_output2,
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       t_output1 TYPE STANDARD TABLE OF ty_output1 ,
       t_output2 TYPE STANDARD TABLE OF ty_output2 ,
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SELECT pobjnr ppspnr i~posnr FROM prps as P
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     for all entries in table T_OUTPUT1
     WHERE      p~objnr = t_output1-objnr.
SORT : t_output1 BY objnr,
            t_output2 BY objnr.
DELETE ADJACENT DUPLICATES FROM : t_output1 COMPARING objnr,
                                                                 t_output2 COMPARING objnr.
LOOP AT t_output1 INTO wa_output1
READ TABLE t_output2 INTO wa_output2 WITH KEY objnr - wa_output1-objnr BINARY SEARCH.
if sy-subrc = 0.
MOVE <wa_output1 fiels> and <wa_output2 fields> to WA_OUTPUT3.
append wa_output3 to T_OUTPUT3.
endif.
ENDLOOP.
Hope this will solve your problem.
Regards,
Sai Prasad

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S VARCHAR2(1 CHAR)
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NA VARCHAR2(3 CHAR)
TC2 VARCHAR2(3 CHAR)
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FROM scott.SMS1 where SNO=(select MAX (sno) from SMS1);
END;
Now in order to update the second table with data from first table on regular basis I have written a job scheduler and I am using oracle 9.0. version...
DECLARE
X NUMBER;
JobNumber NUMBER;
BEGIN
SYS.DBMS_JOB.SUBMIT
job => X
,what => 'scott.SPLITSMS;'
,next_date => SYSDATE+1/1440
,interval => 'SYSDATE+1/1440 '
,no_parse => FALSE
:JobNumber := to_char(X);
END;
Now this job scheduler is working properly and updating the data for every one minute but it is taking or updating the duplicate values also ..like example:
R C S TC NA TC2 NA2 TC3 NA3 TC4 NA4 WTHER SNO
INSERTDATA
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:49:16
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:49:16
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:50:17
R C S TC NA TC2 NA2 TC3 NA3 TC4 NA4 WTHER SNO
INSERTDATA
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:50:17
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:51:19
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:51:19
R C S TC NA TC2 NA2 TC3 NA3 TC4 NA4 WTHER SNO
INSERTDATA
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:52:20
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:52:20
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:53:22
R C S TC NA TC2 NA2 TC3 NA3 TC4 NA4 WTHER SNO
INSERTDATA
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:53:22
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:54:45
33 35 2 123 456 789 543 241 643 243 135 RRRRRR 55
06-SEP-2012 03:54:45
Now I do not want the duplicate values to be updated ...and want them to ignore them.....
please I need a help on this query........How to avoid the duplicate values............

Look at the posts closely:might not be needed if formatted ;)
create or replace procedure splitsms as
begin
insert into scott.smssplit (r,c,s,tc,na,tc2,na2,tc3,na3,tc4,na4,wther,sno)
select substr(rcstcnatcnatcnatcnawther,1,2) r,
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         substr(rcstcnatcnatcnatcnawther,15,3) na2,
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end;Regards
Etbin

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