Query regarding Date Function

All,
Can I know the difference between the following two queries
select TO_CHAR(TRUNC(sysdate),'dd-mon-rr') from dual;
select TO_CHAR(TRUNC(sysdate),'dd-mon-yy') from dual;
However, both the query gives the same result as '03-nov-09'.
Regards
ND

...of which century?
SQL> var dt varchar2(10)
SQL>
SQL> begin
2 :dt := '03-11-51';
3 end;
4 /
PL/SQL procedure successfully completed.
SQL>
SQL> select TO_CHAR(to_date (:dt, 'dd-mm-rr'),'dd-mon-yyyy') from dual;
TO_CHAR(TO_DATE(:DT,
03-nov-1951
SQL>
SQL> select TO_CHAR(to_date (:dt, 'dd-mm-yy'),'dd-mon-yyyy') from dual;
TO_CHAR(TO_DATE(:DT,
03-nov-2051Don't use a two digit year...

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A query regarding synchronised functions, using shared object

Hi all.
I have this little query, regarding the functions that are synchronised, based on accessing the lock to the object, which is being used for synchronizing.
Ok, I will clear myself with the following example :
class First
int a;
static int b;
public void func_one()
synchronized((Integer) a)
{ // function logic
} // End of func_one
public void func_two()
synchronized((Integer) b)
{ / function logic
} // End of func_two
public static void func_three()
synchronized((Integer) a)
{ // function logic
} // End of func_three, WHICH IS ACTUALLY NOT ALLOWED,
// just written here for completeness.
public static void func_four()
synchronized((Integer) b)
{ / function logic
} // End of func_four
First obj1 = new First();
First obj2 = new First();
Note that the four functions are different on the following criteria :
a) Whether the function is static or non-static.
b) Whether the object on which synchronization is based is a static, or a non-static member of the class.
Now, first my-thoughts; kindly correct me if I am wrong :
a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisation, since in case obj1 and obj2 happen to call the func_one at the same time, obj1 will obtain lock for obj1.a; and obj2 will obtain lock to obj2.a; and both can go inside the supposed-to-be-synchronized-function-but-actually-is-not merrily.
Kindly correct me I am wrong anywhere in the above.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation.
Kindly correct me I am wrong anywhere in the above.
c) In case 3, we have a static function , synchronized on a non-static object. However, Java does not allow functions of this type, so we may safely move forward.
d) In case 4, we have a static function, synchronized on a static object.
Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation. But we are only partly done for this case.
First, Kindly correct me I am wrong anywhere in the above.
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".
Another query : so far we have been assuming that the only objects contending for the synchronized function are obj1, and obj2, in a single thread. Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.a; and again obj1 trying to obtain lock for obj1.a, which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed. Thus, effectively, our synchronisation is broken.
Or am I being dumb ?
Looking forward to replies..
Ashutosh

a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisationThere is no synchronization between distinct First objects, but that's what you specified. Apart from the coding bug noted below, there would be synchronization between different threads using the same instance of First.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.obj1/2 don't call methods or try to obtain locks. The two different threads do that. And you mean First.b, not obj1.b and obj2.b, but see also below.
d) In case 4, we have a static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.Again, obj1/2 don't call methods or try to obtain locks. The two different threads do that. And again, you mean First.b. obj1.b and obj2.b are the same as First.b. Does that make it clearer?
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".That's what happens in any case whether you write obj1.func_four(), obj2.func)four(), or First.func_four(). All these are identical when func_four(0 is static.
Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.aNo we don't, we have a thread trying to obtain the lock on First.b.
and again obj1 trying to obtain lock for obj1.aYou mean obj2 and First.b, but obj2 doesn't obtain the lock, the thread does.
which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed.Of course it won't. Your reasoning here makes zero sense..Once First.b is locked it is locked. End of story.
Thus, effectively, our synchronisation is broken.No it isn't. The second thread will wait on the same First.b object that the first thread has locked.
However in any case you have a much bigger problem here. You're autoboxing your local 'int' variable to a possibly brand-new Integer object every call, so there may be no synchronization at all.
You need:
Object a = new Object();
static Object b = new Object();

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Dear Friends,
I am having a query. I have created a Info-cube and established the universe on the top of the Info-cube.The Dat is coming in the Bi system. When I created a new Webi-report the Data from the ino-cube in the universe is not reflecting the Webi-report .
Can anyone tell me the solution for the Data Load in the Webi-report .

Hi,
There are two ways to design universe on top of cube/Query.
1)Olap Universe :Please go through by below link for how to create mdx universe.by this way create one connection and select cube or query and by default designer will replicate cube/query in the universe.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/903a7fc7-19e8-2d10-fa95-b050de946b61?quicklink=index&overridelayout=true
2) Create Data federator project on top of Cube and then design universe.
To pull data in the webi report create universe then select objects and run the query.If data is available in the cube or query that will come in the webi report.
I have already said webi report pull data at run time.there is no need or no way to load data in the universe or webi.
Design a universe and create webi or deski report on top of universe.
For more information you can search on net can be found documents how to create report.
Hope this helps you.
Thanks,
Amit

Query regarding Min function with Date

Dear All,
I have written query as follows but it is giving me error message.
Selection CityCode, CityName, Min(Date)
from Entry
I want to write a query which should generate minimum date of transactions of city. There are about 50 cities in the Entry table and against each city there are thousands of records, I want to display only the oldest date against each city with its code. In the out put there should 50 rows as there are 50 cities and oldest (min) date. Can any one please help on this SQL.
Thanks

Do you want just min date in the table or need grouping by citycode and city name also?
If just min date of the table is needed, use row_number analytic function to get the min date in the table.

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I have created one query where I want to see the inventory data month wise. That's why at first I have placed 0calmonth (with variable) in column, secondly kept all the key figures which I want to see month wise under one structure, then placed the structure under 0calmonth in column. Now in that structure I have one key figure like 'total stock' and another global calculated key figure '% of total inventory' (='total stock' %A SUMGT 'total stock').
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Hi,
now i got whats the issue is.
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Exception aggregation would have been set to 'Last Value' with some time char as aggregation ref characteristic..
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i.e if you provide 02.2006 to 07.2006, %of total inventory for every month would be with respect to value of 07.2006...
Hope this helps...
Dont forget to reward if it helps!
thanks
Message was edited by: Murali

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Hi All,
Hi i want to implement the functionality as below, if i gave the Date as Input then i have to get the Respective Timezones is it possible, if yes then can u plz produce a sample snippet of it.
With Regards,
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Hi
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use the fdate and tdate and write the code
Reward points for useful Answers
Regards
Anji

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Hello
I have created report with custom folder and parameters are passed using sys_context function. I have few queries regarding this.
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Please help me out.
Thanks in advance

Hi,
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hi
i want to write the procedure which will give me the difference of two dates in hours.
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regards,
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I want to read data ( integers , only one column)
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I need to do is I have lakhs of rows in excel sheet
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hello to all
guy's in a form i m having an item i.e refdate now i want to work it like this
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Edited by: Navdeep Kaur on Jul 27, 2009 10:08 PM

Navdeep,
I wrote DD/MM/RRRR not DD/MM/YYYY. If you use RRRR instead of YYYY, then the user can enter 2 digit year, and it will automatically convert to 4 digit year.
Regards,
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If this answer is helpful or correct, please mark it. Thanks.

Query regarding Date Function

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