How to get the date of first day of the week

hi ,
how can i get the first day of the current week ?
i have tried the following
note : my sysdate is 3rd april 2007
select trunc(sysdate , 'ww') from dual -- 4/2/2007
select trunc(sysdate , 'w') from dual -- 4/1/2007
select trunc(sysdate - 4 , 'ww') from dual -- 3/26/2007 -- shld return 25th mar 2007
select trunc(sysdate - 4 , 'w') from dual -- 3/29/2007 -- shld return 25th mar 2007pls advise
tks & rgds

Hi!
I'm considering MONDAY as the first working day of the current week. And, the code is accordingly --
SQL> select to_char(sysdate - to_number(decode(to_char(sysdate,'DY'),'TUE','1',
2                               'WED','2',
3                               'THU','3',
4                               'FRI','4')),'dd-mon-yyyy') res
5 from dual;
RES
02-apr-2007Regards.
Satyaki De.

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Get date of first day of current week

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Why does the following method do not return the date of the first day of the week in which the given date lies?
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Hi there,
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In one ugly line, you could do this by doing the following :
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create or replace
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IS
R_FDOW DATE;
BEGIN
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5            )
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hi,
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How to get the date of first day of the week

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