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Return the Monday in current week

Guys, I am after a piece of sql that I can add to a report that depending on sysdate it will return the MONDAY of that week.

ie today is 9th January so the sysdate is 09/01/2015 the Monday is 05/01/2015

So I would like to have a sql script to show this.

Any Ideas

Thank you
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DarrenJackson
Asked:
DarrenJackson
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2 Solutions
 
slightwv (䄆 Netminder) Commented:
Try this:  trunc(sysdate,'IW')
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sdstuberCommented:
select next_day(sysdate-7,'Monday') from dual

trunc  or to_char as needed
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DarrenJacksonAuthor Commented:
sdstuber I get an error but the example slightwv has suggested is working great.

That example seems way to simple :)  am I right in thinking any day of the week from Monday to sunday if I run it the return value will be the Monday of the current week?

Thanks for the quick response
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DarrenJacksonAuthor Commented:
Sorry sdstuber the error I get is " ora-01846 not a valid day of the week"
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slightwv (䄆 Netminder) Commented:
>>am I right in thinking any day of the week from Monday to sunday if I run it the return value will be the Monday of the current week?


Mock up a simple test and see.  replace sysdate with sysdate-<some number> or a to_date with whatever date you want to test with.

For example:
trunc(to_date('01/01/1700','MM/DD/YYYY'),'IW')
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sdstuberCommented:
>> ora-01846 not a valid day of the week"

Monday is a valid day, the code works for any database I tried it on.  Does your database have different nls settings?

The IW method should work regardless though,  ISO weeks are defined to start on Monday and the NLS settings are irrelevant to that.

Simple test for thousands of dates

select * from
(select trunc(sysdate + rownum,'IW') d from all_objects)
where to_char(d,'Dy') != 'Mon';

if that query returns any rows then the IW didn't work, if returns 0 rows then it worked.  Of course the 'Mon' string is subject to NLS settings though, change as needed
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DarrenJacksonAuthor Commented:
Guys thankyou both for the help
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